Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f707c424ec940…

MALICIOUS

PDF

41.4 KB Created: 2020-09-18 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2422ccf85010ca555e5a23e7baf6eb3c SHA-1: bac2c59d63e6394e273e9799caa9a6d836bd9354 SHA-256: 171f707c424ec94095e0941e841d6f387330582011b482066114ae31e50d371e
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic. One prominent URL, https://ttraff.com/wix?keyword=have+not+been+receiving+emails, is flagged as a malicious redirector. The document body text, though partially corrupted, includes the phrase 'Have not been receiving emails', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=have+not+been+receiving+emails In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667d6acd-6d08-4773-9413-634986032836.filesusr.com/ugd/f1d680_1e5d1b4176814100ad8187c7d82c2009.pdf?index=trueIn PDF document text
    • https://ee14d8e0-97f0-4ef5-b292-187a25952325.filesusr.com/ugd/2eff39_fae18b6172a843f693f6600e62ba5636.pdf?index=trueIn PDF document text
    • https://5b3c9a97-cf03-45e8-bcea-8214fda86683.filesusr.com/ugd/b50c55_a3ceb5006a7f468b9551751fc4fea0f4.pdf?index=trueIn PDF document text
    • https://7e006205-f4f8-409f-b2da-7fcb4165d15f.filesusr.com/ugd/c5d40f_b3f0cfd0e4d44a94800368a4b4960912.pdf?index=trueIn PDF document text
    • https://b3575990-1ce0-42b4-88f2-65624572f48b.filesusr.com/ugd/7ab50f_7d05264734e64668b44bf7c95e07fa66.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/mevixutiriler.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7848/3097/files/purukofemelubinofas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/90107192906.pdfIn PDF document text
    • https://dcce8276-1663-4194-a9b9-bda03013eee9.filesusr.com/ugd/3be48b_788020053a734c109c2e174781198636.pdf?index=trueIn PDF document text
    • https://bec4a89b-731c-4a5a-ba0c-4115f7b57b13.filesusr.com/ugd/3bcfef_4f2f47fa87d64c338335ba96d9afaef3.pdf?index=trueIn PDF document text
    • https://910cd1fb-1198-444f-afcf-d1a0ab71af1b.filesusr.com/ugd/f67134_209917aa94e24a61a8f16039859776d5.pdf?index=trueIn PDF document text
    • https://b3b827b7-6f63-4e62-b3c7-d9d89641e699.filesusr.com/ugd/d2759c_d5d958b4647d4b33aa9de66e18bb3a43.pdf?index=trueIn PDF document text
    • https://0b5f8a9d-d659-4027-a5d8-2b978b4a978d.filesusr.com/ugd/3e87bf_038f4734f451448ba8ff15936d61e4a3.pdf?index=trueIn PDF document text
    • https://2e9f76bf-2ba1-44c0-b809-7396d0b76162.filesusr.com/ugd/576447_2a74eafaf53b4b059fbf027f5f9f4c41.pdf?index=trueIn 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_off0000643f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 5280 bytes
SHA-256: a7dfb4c48cd39225258d124e8844be866b1ac444bb6ad829ffecc19e1786c694
font_01_sfnt_off00007620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 10124 bytes
SHA-256: 6a3da5701752082f61f7466119e39bb62e9d89f77fb4a7ba444c2ced0780b0bd

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