Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d18e33578509b23…

MALICIOUS

PDF

54.9 KB Created: 2020-10-30 11:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 56460229df9c17bc9772205a35f4afc2 SHA-1: 2e90daf63a5adc6f2f3b88d6e5d13c98f672544f SHA-256: 5d18e33578509b231da872d34bc35a4e6a8ecd199a60eec798aa5c09b3a1b02d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and other links that appear to be part of an SEO link farm. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via a deceptive link.

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://ttraff.me/123?keyword=rolling+stone+gathers+no+moss+meaning+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f8c01b19af94.pdfIn PDF document text
    • https://pedutiwoda.weebly.com/uploads/1/3/4/4/134481784/991847.pdfIn PDF document text
    • https://xukabasal.weebly.com/uploads/1/3/0/7/130776322/tofolupedagonem-kasalomubod-sulake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8bbb6ccbc0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f942c27063c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/cdl_drivers_study_manual_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1429/7032/files/degree_courses_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9788/9193/files/wodamipowobeteduwepamem.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/redazikogi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/ziwafalifo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/81642796347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4303/1702/files/cody_bellinger_salary_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7680/5308/files/zutuwukupefa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 5104 bytes
SHA-256: a7450b399d1a6f43a7ff3a010bd708197c5f7499e9b2ae1e33301fc840ac71d3
font_01_sfnt_off000081f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 10960 bytes
SHA-256: 08b63100195ec32a09358aaddbe3e1738a6b233392cdfdea92e3032a552b29b6
font_02_sfnt_off0000a78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA78F 22836 bytes
SHA-256: e5bf9e445b719d9c6f1393ac497a455d8fd692201664850a49a05b8f52a286af

Open this report in the interactive analyzer, or submit your own file for analysis.