Malicious PDF — malware analysis report

Static analysis result for SHA-256 706fa3b940f44662…

MALICIOUS

PDF

54.1 KB Created: 2020-08-04 09:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1435e54840e51e678a56bc5b5778468 SHA-1: b57c32e01b2f5e811d3495f3006d401737a4c3cf SHA-256: 706fa3b940f4466277306902ca884dca97f2357443d336219f9a3f14fde841ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=600+pares+biomagnetico+pdf+para+descargar'. This URL is likely used to direct users to malicious content or phishing pages. The PDF also exhibits characteristics of an SEO link farm, with numerous embedded links, suggesting an attempt to manipulate search engine results or distribute spam. The ML classifier strongly indicates maliciousness.

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=600+pares+biomagnetico+pdf+para+descargar
    • http://files.live-for.org/uploads/1/3/0/9/130969683/fawusip_bokubazifusetok.pdf
    • http://files.clearriverredangus.com/uploads/1/3/1/4/131453198/2c28d4a3.pdf
    • http://files.hazelburnhamdesign.com/uploads/1/3/2/8/132816195/wufiwiwibi.pdf
    • http://files.nfr16.net/uploads/1/3/1/4/131453725/najutinaweromilivixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/89801109071.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/wopotavodadofela.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/19886773609.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/19932918135.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/pedadunasuxarefatit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/salil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/fipuwesoxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/dowevisutufuxifis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/7_catholic_social_teachings.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/54338127508.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_off00009158.bin
25f4cfdd9cca233b11120438f74aec83f05175c7d93179447ec4acb39ad49fab
pdf-font-stream PDF embedded font (sfnt) at offset 0x9158 5784 bytes
font_01_sfnt_off0000a4e9.bin
8b81c46e0ea9f22ee11242584e2c6ab8cbcd16c46dcc1f6fd2c83cce75bca446
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E9 11708 bytes