Malicious PDF — malware analysis report

Static analysis result for SHA-256 625a121a1ab44054…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 10:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0418076a4765b36617036efd5a4d2d76 SHA-1: a4e241b3a29d6e2e269375f33a3fd4ac29317fee SHA-256: 625a121a1ab44054dc2f09df708dca68b6869ca6a825472f0faf8846207ba7fd
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 of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/pify?keyword=comment+in+css+stylesheet as malicious. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent.

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.cc/pify?keyword=comment+in+css+stylesheet
    • http://files.ktshepherdpermaculture.com/uploads/1/3/2/6/132682790/gasigirunawofu-kirawevesoxowij.pdf
    • http://vevufe.autumnlealshopp.com/uploads/1/3/1/4/131407995/2514336.pdf
    • http://files.harpersferryboostersinc.org/uploads/1/3/1/4/131437246/5013930.pdf
    • http://risew.midwayusancrs.org/uploads/1/3/1/8/131856427/vobosuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/programming_abstractions_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/viriwufifefavaliwone.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/wodagujudoriwoluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/napekunagejipupojeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/4020/2142/files/65784925390.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/bitsat_previous_year_question_papers_download.pdf
    • https://cdn.shopify.com/s/files/1/0466/2591/5045/files/yeah_sure_why_not_answer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/mesigesimidiwogipivemux.pdf
    • https://cdn.shopify.com/s/files/1/0451/8245/1861/files/10470362524.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/78319579315.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/25963258253.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/arrhythmia_causes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/fubolaxexakixuruwegisop.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_off00006081.bin
0de600450727d1ad21bee7e26a68b0812f5aa1b87cb2f1fb18fc027fcd39b2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 4740 bytes
font_01_sfnt_off0000707b.bin
7cc98dcf6c7ddd0df0e93ccc9bbf671e03b60f84976fd45887190f00027b71d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 13412 bytes

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