Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4dc12434c1e99b…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 11:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30fd3c9e13920796a61ad1fda08ddf8 SHA-1: 56ce1f0b4afa2934ade80f8a7b8b5756e6dfde86 SHA-256: 2a4dc12434c1e99ba9df609a49ee189dfefd7fd28456ed6890caa9a554709cfb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=nouns%20worksheets%20for%202nd%20grade', which is flagged as malicious. This suggests a lure to download further malicious content or redirect to a phishing site, disguised as educational worksheets.

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.cc/wb?keyword=nouns%20worksheets%20for%202nd%20grade
    • http://files.actionsforhealthcare.com/uploads/1/3/1/6/131636941/03baa2f143730.pdf
    • http://files.esteachers.org/uploads/1/3/1/4/131453990/kowanajegaxugetesa.pdf
    • http://files.nstcricelake.org/uploads/1/3/1/4/131437535/toriluxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/gijulut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8918/2376/files/12676361907.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/patogenesis_anemia_defisiensi_besi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/77124026432.pdf
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/miresesupizugow.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/lavataxigadivujowireve.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/76650093312.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/62426188604.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/49189548690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0429/3754/8959/files/50720702224.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/steamvr_oculus_quest.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005647.bin
76fff6f790a0ea77f9757dd9161f9e9d6c93a945cadf13217678ced2f889f20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5647 5228 bytes
font_01_sfnt_off0000681c.bin
7742fc0aa1e1e34d8f6977b8bedbe335db75e76a0ea9b7dd414f83e6ab769f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 9792 bytes
font_02_sfnt_off000089ad.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AD 4324 bytes

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