Malicious PDF — malware analysis report

Static analysis result for SHA-256 120c26efd43c2a7e…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 03:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009ea88581bb5bbd0e0681b7f3edb5dd SHA-1: babc87c8b8c2b71a585d8aa7ddd3c76c58001929 SHA-256: 120c26efd43c2a7ee63c283893eeeb8c79b469d37b44b1b54936bc9c0e2a8ae2
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to a link farm infrastructure designed to redirect users to malicious content. The primary redirector URL is identified as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=above+the+line+promotion+pdf
    • http://zabitowuf.ohiooutdoorstructures.com/uploads/1/3/1/6/131606490/sijusupogepokupo.pdf
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/8/130874612/8397628.pdf
    • http://files.venlas.com/uploads/1/3/1/4/131482884/gomineximesoravaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/76849875660.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/zutuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/curso_completo_de_economia_em.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6175/files/karepapemajesazifidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/24078439559.pdf
    • https://cdn.shopify.com/s/files/1/0438/2117/0850/files/97258975469.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/82267806404.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/simple_antonyms_and_synonyms_list.pdf
    • https://cdn.shopify.com/s/files/1/0448/0057/3601/files/nier_automata_official_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/factorio_load_balancing.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_off0000709e.bin
b705c2861c833f87422e3cc10aaee6b11474aa4c9cb821e05cccf1540d92c110
pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 5080 bytes
font_01_sfnt_off000081be.bin
0aa5efc7841cb9b9ee550d1b59867c81696d165335762c5c1b111149e86e6c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 10192 bytes