Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c39d7ab82ebdf1f…

MALICIOUS

PDF

115.9 KB Created: 2020-08-24 19:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55cb80f966e9487bc27031a165ad5ad9 SHA-1: 9c91637c80cd38d3d992ab557edcd5f91e04ba69 SHA-256: 5c39d7ab82ebdf1ff98f7c86acac91d4f8888fbbe79381b493583fa8966f35e9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of many external links suggests an attempt to manipulate search engine results or to distribute further malicious content.

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.com/pify?keyword=t%25C3%25BCrk%25C3%25A7e+okunu%25C5%259Flu+cev%25C5%259Fen+pdf
    • http://files.talkyogaslp.com/uploads/1/3/2/3/132302963/2671630.pdf
    • http://kusuvera.diycottage4u.com/uploads/1/3/1/8/131858530/lulavawowidoviju.pdf
    • http://vutuba.royalmarineser.com/uploads/1/3/1/8/131871787/zamazarasa.pdf
    • http://files.alliedanklefoot.com/uploads/1/3/1/3/131379748/2b62b3f4683b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/90215142644.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/asthma_treatment_guidelines_aafp.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/tofixaleduropopiminelixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/hotel_formule_1_paris_bagnolet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3567/2219/files/5669467702.pdf
    • https://cdn.shopify.com/s/files/1/0438/2552/8989/files/bugulazaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/xijagezelefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/cajun_injector_smoker.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/33130033832.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/disk_write_error_steam.pdf
    • https://cdn.shopify.com/s/files/1/0457/9475/4726/files/video_ugly_alert_sub_indo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1189/files/ziwawuderureles.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/60017400155.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_off000179d7.bin
d9c9f54f915411f4bf324bda9e0e252122fb2b712472c69a95939fd7eeaa6d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179D7 5384 bytes
font_01_sfnt_off00018b9b.bin
151fd87055e9ca343c909b991922532f40dca6840a673304b17b2eecf4d1b7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9B 19208 bytes

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