Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17e3ee476a01752…

MALICIOUS

PDF

59.4 KB Created: 2020-08-04 23:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8045c9d7ee48f71426f54abc5b197c SHA-1: b484e1990d1ac5d5541032b74ec8fd4210b716d2 SHA-256: c17e3ee476a01752d3bb8eda71cbd81f599d8b50aaf33dc32f6488437e97280b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=jboss+application+server+interview+questions+and+answers+pdf, which appears to be part of a scheme to drive traffic to numerous other PDF files hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=jboss+application+server+interview+questions+and+answers+pdf
    • http://files.leapoffaith4u.com/uploads/1/3/0/7/130775953/4255752.pdf
    • http://files.workpurposefully.org/uploads/1/3/1/6/131606490/pavaloxoroge_pabasani.pdf
    • http://files.kflatham.com/uploads/1/3/0/7/130739002/vasepuwoforu.pdf
    • http://vamow.shepherdssecurity.com/uploads/1/3/2/7/132740214/1691683.pdf
    • http://files.whiterockmedical.com/uploads/1/3/1/8/131856632/3074137.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/kotuwuzeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/fudibagepituwuxezagoxilas.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/tasesodeguxago.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/50227629151.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/vasover.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/17115138899.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/clavicula_salomonis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/28155657989.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/40483481128.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0439/1475/6251/files/9440072011.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009448.bin
b97bf919f320353b59a5969cea2e87187e038b8b0e918266945a9873acd25197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9448 5436 bytes
font_01_sfnt_off0000a6cf.bin
a587cc45be7efee3ff2aed13bf9b392036f5a040caea742a17150a41620524df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CF 13356 bytes
font_02_sfnt_off0000d1cd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 4324 bytes

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