Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f608c25a3f9ee3…

MALICIOUS

PDF

53.0 KB Created: 2020-08-14 18:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bdb29fc3cd630ed107b05df69009186 SHA-1: 96a5d01d6f2222a9aa456ffd8ac424a282e94c19 SHA-256: 67f608c25a3f9ee3cb88b2b79d4fa57b60e2292c7f599261b06539151182a214
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a phishing or redirection scheme.

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.com/pify?keyword=guided+reading+chapter+book+sets
    • http://files.aaroncitti.com/uploads/1/3/0/9/130969476/gegatofisu.pdf
    • http://files.dsempoweredlife.com/uploads/1/3/1/6/131636990/6838276.pdf
    • http://tekovidi.orlandodeleon.com/uploads/1/3/1/6/131606349/52a45c99afc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/23535403901.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/25119272419.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/nfl_divisions_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/noruwipudikiku.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/befejokiwujiseza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/kuvususijuruto.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/malipesuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/zedubisavofinotisifoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/4586/2041/files/inter_botany_textbook.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_off00009090.bin
554d04835c3dc2b3d0d1b72f11ff8a632cbbf64f36eed48d992a22b04a2b8717
pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 5540 bytes
font_01_sfnt_off0000a350.bin
13ae58b9f7cf530062b533594a3f76798123f28ce90a58701c70f1bca645dc94
pdf-font-stream PDF embedded font (sfnt) at offset 0xA350 10560 bytes