Malicious PDF — malware analysis report

Static analysis result for SHA-256 71927a88668c51fb…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c675e1f7a920fbea8418ea9a11bf68a1 SHA-1: 0b9cc90d25cc13f0ffce308400a00713c2a70392 SHA-256: 71927a88668c51fb7d9e1152f8a8db87329dfd2968a301955358fb5e7aa9c857
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are disguised as PDF files hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=secretos+de+una+noche+de+verano+pdf, is identified as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious sites, 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/wix?keyword=secretos+de+una+noche+de+verano+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2243/4972/files/wunibun.pdf
    • https://cdn.shopify.com/s/files/1/0435/7160/9761/files/gagotokonawaxutejewoke.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/asphalt_8_hack_android_oyun_club.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/garojof.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/fosoraxede.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/54847402001.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/91728200327.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/after_2_gratis_espaol.pdf
    • https://static.usrfiles.com/ugd/99965f_8c658948dfcf4604af8c113030d0619f.pdf
    • https://static.usrfiles.com/ugd/9e53d4_41126be242ce436c96beb22badb55320.pdf
    • https://static.usrfiles.com/ugd/3cb679_5ccc85fcfe5142dc9d70ff5c2de8b9aa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/adobe_creator_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44758106853.pdf
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/xubefiravazadasumoveruz.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_off000076b6.bin
1a5d17cd8127337a639d0632aa6bb105b9bb7176055ad79fa0efc87a77497ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 5372 bytes
font_01_sfnt_off000088f5.bin
a5e53384f538c47b25996e92441c649ee24030d790c3b9a62b1311dc6e394eee
pdf-font-stream PDF embedded font (sfnt) at offset 0x88F5 11428 bytes