Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f156720d3c03402…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 07:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ae78a20c654a47211112a37be37af6 SHA-1: a5a17abb0dca9eed8e52896fc760e7955546130d SHA-256: 5f156720d3c03402dc2acea7b87360f51ae2ae210d16487018045411e9ed6154
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 pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. The primary malicious URL, https://ttraff.com/wix?keyword=como+para+instalar+unpasted+grassclo, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious content, 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.com/wix?keyword=como+para+instalar+unpasted+grassclo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/71939557330.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/assassin_s_creed_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/rakodoniboletulenuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/discord_bullet_points.pdf
    • https://cdn.shopify.com/s/files/1/0433/9099/2549/files/regulation_of_cell_cycle_and_cancer_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/87892876212.pdf
    • https://static.usrfiles.com/ugd/37321e_e57b184d2aa14aae853175328e9a6991.pdf
    • https://static.usrfiles.com/ugd/b5aed9_7f779dc2b763435ba663ae64d3d1cc7b.pdf
    • https://static.usrfiles.com/ugd/4725f1_ce7a53149add45f98ee6ce1f8dc95f9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_54c02dc63e814b59bbefa14dc285ba65.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_off00005c8f.bin
519788d41aa398709811d1e9d4edec3b1e64e61d204bfeaa7e93d11d0413a613
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8F 5300 bytes
font_01_sfnt_off00006e71.bin
654c0677c9e2c1fe9451abfd43a13ce0f37269991d8e779661b18e19ecfc6c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E71 10456 bytes