Malicious PDF — malware analysis report

Static analysis result for SHA-256 94028cdf504696c5…

MALICIOUS

PDF

50.8 KB Created: 2020-08-19 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2822c7e48987e651c92f1b93b91b149b SHA-1: 12516fa797800151442a06235f5bb702fa0498d1 SHA-256: 94028cdf504696c55e62bfe6b133ece4b6121b8b8fb26196e1c73315fe1d0ca4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aambala+movie++in+moviesda'. Another critical heuristic flagged the PDF as a link farm, with 30 external PDF links generated, suggesting a coordinated effort to distribute malicious content or engage in SEO spam. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links and the presence of a known malicious redirector are strong indicators of 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.ru/pify?keyword=aambala+movie++in+moviesda
    • http://fewovom.martychristian.com/uploads/1/3/0/7/130776213/959659668cd3e92.pdf
    • http://files.uogcbssc.ca/uploads/1/3/0/8/130874324/wugidijiposa-givasamom.pdf
    • http://pokawo.tonystledger.com/uploads/1/3/0/7/130739830/legasejalinisifimif.pdf
    • http://files.iancarlsen.com/uploads/1/3/1/4/131483108/dobunof.pdf
    • http://files.jsmediadownunder.com/uploads/1/3/2/7/132740408/jolaponukudida_funom_likotemepigimog_defugakimum.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/letetupoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/7314/9859/files/16115356595.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/8792566331.pdf
    • https://cdn.shopify.com/s/files/1/0448/5254/3649/files/digeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/xifijepewufadetemonofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8839/5936/files/zajevi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/40973102829.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/raxodufaxidodipenejipopos.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/bunekataporipazolujidukij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.pdf
    • https://cdn.shopify.com/s/files/1/0429/3872/8604/files/28878095733.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/kezik.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_off0000745b.bin
9ad44945257627fe645f5da6d67946252c706ad3997b4984a1cfd56faf4364cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 5064 bytes
font_01_sfnt_off00008586.bin
6c99170e8334188c013db757c5d6e51034f81039fe09b1845d26aeff99fef0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 10356 bytes
font_02_sfnt_off0000a91e.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91E 16164 bytes

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