Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dc5cdb01baa5f9…

MALICIOUS

PDF

32.7 KB Created: 2020-08-10 10:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a568bebfb803a3fd6e888165e4e8c2 SHA-1: fc8924ce992c7442e4c05470bc562af243f52461 SHA-256: 09dc5cdb01baa5f91f4ee20f772ef4d30f7236eeba488292c8073c95ff213f05
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the links leads to known malicious infrastructure. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

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=jurnal+retinoblastoma+pada+anak+pdf
    • http://files.southtahoefootball.com/uploads/1/3/1/4/131483386/1239856.pdf
    • http://files.613studentrentals.com/uploads/1/3/1/1/131163533/9293b421.pdf
    • http://files.aroanuicats.com/uploads/1/3/2/3/132303013/finibesatogirozeji.pdf
    • http://files.swimuk.co.uk/uploads/1/3/2/7/132741155/2490273.pdf
    • http://files.stellabread.com/uploads/1/3/1/4/131437977/liziwurafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/kanebaxupelufus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/lakekixud.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/waving_flag_lyric.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/farmall_h_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegofegomena.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/tupewuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/87342146906.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/96291174271.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/25580017933.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_off00004498.bin
3e873f40aa7d37d95210fb3dd179e4a52fad8c4b1ffb3520fdbbcb013852f935
pdf-font-stream PDF embedded font (sfnt) at offset 0x4498 5380 bytes
font_01_sfnt_off000056c9.bin
a3e49f2368328b505bc0bde35c0ae8099ddc4531482d1b05d1ae9c4ad8af0919
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C9 9092 bytes