Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72dccc52ee46eb1…

MALICIOUS

PDF

33.6 KB Created: 2020-09-17 03:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d383544b4fd3a91f49c6cae11de3c4bc SHA-1: 0247c35dd49138b1056380848bfd53aee987788d SHA-256: b72dccc52ee46eb15fddc84b0616db6f94ac038f74ff93df14e7855251479d7d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a guide to steam locomotives. This indicates a social engineering lure to redirect the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to the redirector.

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.
  • 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.
  • 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/wix?keyword=guide+to+north+american+steam+locomotives
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/49668901186.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6607/files/88943735004.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/xefepused.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/technical_analysis_for_dummies_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8654/4022/files/zosyn_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/skin_creator_minecraft.pdf
    • https://c8cd3aa5-8262-4b3c-bfdd-02779a0c7bd8.filesusr.com/ugd/2c608b_ad82c9a8e7d640fab6d4f29a4b1cf5bb.pdf?index=true
    • https://532e96e0-b1ac-4bb3-9552-cb15e79498b1.filesusr.com/ugd/9f2514_643357b6ae7345bfb44956517cb9e73c.pdf?index=true
    • https://ccedd517-1eae-417c-a46a-3366a42cde3e.filesusr.com/ugd/b0cb2d_96708973573142ac82a5b99f9e407432.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/faras.pdf
    • https://cdn.shopify.com/s/files/1/0457/6519/7988/files/aortic_abdominal_aneurysm_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/famulogux.pdf
    • https://cdn.shopify.com/s/files/1/0479/3771/6391/files/84828267155.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000470e.bin
f617fc431f238577ac43c42483c202485e4d67f8d1f31f93a8b615d6ae6b8577
pdf-font-stream PDF embedded font (sfnt) at offset 0x470E 5268 bytes
font_01_sfnt_off000058d1.bin
1bb09b21fedeb419f23b537af182f3a397c39bdc05582bb69b75a774acc92de8
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 9664 bytes