Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad18b0f942e5691b…

MALICIOUS

PDF

38.1 KB Created: 2020-10-25 23:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc307da1a39e9864433c7079079b4b19 SHA-1: 300a9539232cc0ad1a646067302c7347876efb62 SHA-256: ad18b0f942e5691b6cb25cbe0221b06c46f1e495d921a213dd5a584e080f3d0d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links and a lure related to a 'Fisher Paykel dishwasher f1 error', directing users to a redirector URL. This suggests a phishing or malware distribution attempt, leveraging a common user problem to encourage clicks. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to SEO poisoning or link farming tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=fisher+paykel+dishwasher+f1+error In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f90597468125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87338237c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f92669536bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f9036ea30494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f959a87bac4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f8a167c3273d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f92c0f130223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f8e0d8a70386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9883/1527/files/respawnables_6.8.0_apk_data.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/xerupiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1485/0213/files/68172460119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9372/8666/files/injustice_gods_among_us_ipad_hack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6823/4168/files/seales_reglamentarias_de_transito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6867/8839/files/printable_gujarati_alphabet_practice_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8840/5191/files/91616455385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3269/0339/files/ohio_state_football_channel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5480/8221/files/29471347879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/lureroxikekunebanawope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84e6819-fb61-497b-a0b3-c62537129fb0/world_of_tanks_tank_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82e2923-6e35-4bc9-872d-2d97c13baaaa/fipowopumunimavevos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02dbe512-c494-48af-a880-aaae13b9d772/janinoti.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/type_two_diabetes_mellitus.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/mastoiditis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/caterpillar_3516b_parts_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AB 5396 bytes
SHA-256: 42fa6fb922eb4d657ee31af9f606f966cd1abd37fcf40c8682756b478c3bea4e
font_01_sfnt_off00006a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A15 9696 bytes
SHA-256: 8594a06c65a30a494c589fe7217dd354e920b18f0c7b9eb483ca184438f1ed43