Malicious PDF — malware analysis report

Static analysis result for SHA-256 418777541eededbd…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 02:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 937b00519ea98ee4db202c3201dc7dbb SHA-1: 30371f3743908cf8ce31e21d8cb4c137b73d5da4 SHA-256: 418777541eededbdf55024960f56580cb22ada5602200a5eab56d63e7bbd7657
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to a malicious redirector, disguised as a cloze test practice set. The document body itself is heavily obfuscated but contains the same redirector URL. The presence of numerous external PDF links, many pointing to unknown domains, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated 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.com/pify?keyword=cloze+test+practice+set+with+answers In PDF document text
    • http://nixap.canaryvilleriders.com/uploads/1/3/0/8/130874388/lixovemopam.pdfIn PDF document text
    • http://files.frontrangetheatre.org/uploads/1/3/2/6/132681026/vurogoxivule-paleturisu-dabid-gufomajetal.pdfIn PDF document text
    • http://files.nanopintechnologies.com/uploads/1/3/2/6/132681513/8415462.pdfIn PDF document text
    • http://files.imural.ca/uploads/1/3/1/3/131381288/7bacfec07d64f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/balarama_mayavi_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/7902821261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7524/7003/files/ice_sheet_vs_sea_ice_rimworld.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/john_mayer_torrents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/lavizusidujabanoduwol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/76194220945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/fifuwubonuporelolafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/44000668860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/munataxevuforedoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/rinexezoputitibowip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A0 5068 bytes
SHA-256: 8c10689f6492e220c65b47c4a9b637b70979d8398898cb88c14ba1ea82ee0a22
font_01_sfnt_off000078f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 10356 bytes
SHA-256: 5cfd6fdec48ab64e52d7efa0a11f1bcff612218e591671dc43ae726109da002b

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