Malicious PDF — malware analysis report

Static analysis result for SHA-256 da14d380994df64c…

MALICIOUS

PDF

40.5 KB Created: 2020-11-01 00:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73680b155a637c297c258e4907c23ebe SHA-1: 253ce1ca28a7f8dbbbe95614cf3871073f4262ae SHA-256: da14d380994df64c6231e06bbd92b1dd43ebafcf87195a500073440858382757
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised as "Alamo colleges pay scale 2017" which redirects to a known malicious URL. This suggests a phishing or redirection attack aimed at tricking users into visiting a compromised site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=alamo+colleges+pay+scale+2017 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_5f977f7f13860.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/1/0501/7626/2298/files/realidades_1_capitulo_4a_guided_practice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f576de-0dc5-4595-bcf0-66a8f50eaaa7/64720800359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4458/7688/files/48343274906.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/80700583507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb04d9a-e273-4085-9d41-901fec3138c2/15816914229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d67c4fd-2760-46c2-820b-5cc81b1abc52/tusiwudenabagazemubop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5178/6145/files/88532629722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3531/8212/files/kumifubidolete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4775/5172/files/32304965706.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_off00005dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 5656 bytes
SHA-256: 1a9113c8dccd339e3296b6a33a45b6b6d7e522d8b7e47449bd9fe66769edb466
font_01_sfnt_off0000710d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 10756 bytes
SHA-256: 1d19e0ae0fbcfa3f0a786588d765cc01816f8b114bb196788b9ff6ecaf3bce43

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