Malicious PDF — malware analysis report

Static analysis result for SHA-256 664bef4dafec9a38…

MALICIOUS

PDF

44.2 KB Created: 2020-08-04 07:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d06f5c60412df49835f6541d900f10 SHA-1: f54946b443bfcc6870b11043a5d33f860889101c SHA-256: 664bef4dafec9a38da413273386cc10e691ab67bb3ed4cc4cbaae42271fcac5d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The document body text and embedded URLs suggest a lure related to sewing patterns, which is likely a pretext to disguise the malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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=japanese+sewing+pattern+book+pdf
    • http://files.whiterivermwd.com/uploads/1/3/1/1/131164157/ruwuvat.pdf
    • http://nupatogi.farmandranchdogs.com/uploads/1/3/0/7/130738870/jexexilisozipo-maletefegowedi-mifudujizirakob.pdf
    • http://files.billyburkefans.com/uploads/1/3/1/1/131163669/tenoneravemare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/vafozebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/37554577002.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/terraria_cool_houses.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/gekow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/kebubuguromikakezarobama.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/bumedekalotuxigilipexena.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/mowerit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/26398602567.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/gaparefudokazanuga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006172.bin
e017fb5a274670b59a47bb090ff4b4b15ebf20724f97cdd955c556e2747ae84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 5252 bytes
font_01_sfnt_off0000735e.bin
6674d78e1cf71ee2e259663fd5f97b54d14fd67018579bbbff695d2e25a573c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 10052 bytes
font_02_sfnt_off000095b7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B7 4324 bytes

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