Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad1cfc94720012…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 02:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e36370cc03b839df6f3005f0417e6f6b SHA-1: 6880468709ff1e27a3a6b136d53eaecac3333858 SHA-256: 11ad1cfc947200124c3bf26dbb648334b63c0604250bd174709908ec7e015b77
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'hepatitis b pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of many external links points to a link farm strategy, likely to improve SEO for malicious content.

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/pify?keyword=signs+and+symptoms+of+hepatitis+b+pdf
    • http://files.macombcountyretirees.com/uploads/1/3/0/8/130813846/8211006.pdf
    • http://files.upwardspiralcc.com/uploads/1/3/1/3/131398308/6416517.pdf
    • http://files.lisawbwalker.com/uploads/1/3/0/7/130776358/disotosidopakemudiwa.pdf
    • http://files.libbiessimplejoys.com/uploads/1/3/2/6/132680986/turen.pdf
    • http://rejol.kenrubitskyassociates.com/uploads/1/3/0/8/130815009/5178666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/ranij.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/d3._js_heat_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/favozuxonijo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/54027940806.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/simonu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/zumumafivomovor.pdf
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/job_application_letter_for_pharmaceutical_company.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/pizzaiolo_menu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/98830441441.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3718/files/diregi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/7032126455.pdf
    • https://cdn.shopify.com/s/files/1/0440/0729/3086/files/jidimitab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/51017924433.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/zusogodam.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac1.bin
26dcc0b3d4f324fd76e302505d04a0aa385c91f01cffb02822ef55c1c667b5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5672 bytes
font_01_sfnt_off00007dee.bin
3d34e43243d0b8d474b76610ae9458b8675405a8173028cb1cea24e8b0329b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEE 10208 bytes

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