Malicious PDF — malware analysis report

Static analysis result for SHA-256 151fc32b33967b4a…

MALICIOUS

PDF

44.2 KB Created: 2020-08-04 20:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bdbacc94f3ff54188a8f463f12ac648 SHA-1: f2d9e8b922fb29e5002d2a337051906dfc476880 SHA-256: 151fc32b33967b4adbf5dd6625db92086562653767dd4081f2dd16fd46f4520d
154 Risk Score

Malware Insights

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

This PDF file contains a link farm with 28 external PDF links, many of which are SEO-optimized. The primary link, disguised as "Acoustic guitar lessons pdf", redirects to a known malicious infrastructure at ttraff.ru. The ML classifier strongly indicated maliciousness, and the embedded link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.ru/pify?keyword=acoustic+guitar+lessons+pdf
    • http://files.bitsnpiecesofme.com/uploads/1/3/2/3/132303071/9829e0a397c1.pdf
    • http://files.aoptech.org/uploads/1/3/1/8/131872178/541b25cfcb64.pdf
    • http://files.heavencanbefound.com/uploads/1/3/1/3/131384018/tizalunovemili.pdf
    • http://files.mrucubsdanceteam.com/uploads/1/3/1/3/131398095/abb70ece949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/tejimenezekinofaxaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/tipos_de_anemias_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/3._5_wizard_spells.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/57467028896.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/libro_el_bogotazo_memorias_del_olvido.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0422/files/denalabeza.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/3097581202.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/63402094300.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/kivulowag.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_off00006fa8.bin
012fe077347f680787d21cf30833e44aaa676f5bc71feb784af1e6b669e7ae01
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 5312 bytes
font_01_sfnt_off000081cc.bin
de989a22bd4e1bd475156879708cd87a51273492c4c2da413ebf78e75c72e669
pdf-font-stream PDF embedded font (sfnt) at offset 0x81CC 10024 bytes