Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d19b419c98aa8…

MALICIOUS

PDF

47.7 KB Created: 2020-09-05 09:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 34a1180b882039d45fc0c3ba16c6d449 SHA-1: eec7ea0ebc1543a6ccd6c2f01378ea35552e26a2 SHA-256: c31d19b419c98aa855a141fd6bf5ff7268fe51b56ad9d10a60639263ea1ebcb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs pointing to external PDF documents, a technique often used in SEO link farms or to distribute further malicious content. One of the embedded URLs, 'https://ttraff.link/pify?keyword=cars+logo+with+name+pdf', is flagged as a malicious redirector. 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.link/pify?keyword=cars+logo+with+name+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/e481ce_30924d4d7817401ead3d1ed670a37c59.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83e584_d794bee1667341a8a891dc136951259b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ae059d_b00ddd1f5b88476d815147cab08f15b7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee4d88_0d4c6c12a06f402a9e37fa9414b50ebb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/wupofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/95139007997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/jalat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/cause_and_effect_of_bullying_in_school.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea2f88_3f91b98622b8444e8913b5f8aed925e2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a4c1fa_bc9021c594af4fbfa806079e548daf8d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f3ac6_a66bc6eb013f4f368b8399267676765c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a8ca0f_c6a2c57f15cd4bb99584cdf5713fbd7e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6a60fd1361b84521a6891fcd4932acbd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/lufoludotavenimetesuludud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/sizikebupovokalus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/tejeroremobigegu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 5356 bytes
SHA-256: a539316478a4c710db64c3b943c4ae9b4f1b8023b2fd418f9c4a80bcfda156b4
font_01_sfnt_off0000811e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811E 10096 bytes
SHA-256: 4d708bd048054e5cd83e593c677634c8296c039013e3599225593ac0dd22d101
font_02_sfnt_off0000a3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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