Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06531f3092fa11c…

MALICIOUS

PDF

49.6 KB Created: 2020-08-01 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d752d9fe58f0b7d2d37a75aba1ff1464 SHA-1: 446baf7f949cc08256ed3e45316bda0be96b3c34 SHA-256: b06531f3092fa11c097074d1a444c7c4040631bcd38276f6789dd2c9cb98383f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm strategy. One critical heuristic identified a link to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself appears to be obfuscated or corrupted, but contains references to the redirector URL and several Shopify URLs.

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=mercury+xr6+150+manual
    • http://files.wardswaterpumps.ca/uploads/1/3/2/7/132740204/ligexupowenik-rofibinu-tadixodetugujej.pdf
    • http://files.millomrufc.com/uploads/1/3/1/4/131454496/2ac9c0daa57b0b.pdf
    • http://files.desireestokkel-nl.net/uploads/1/3/1/4/131407369/sutunujupetigu.pdf
    • http://files.artculturetourism.co.uk/uploads/1/3/1/4/131409677/5f6c5.pdf
    • http://files.baldwincountybossbabes.com/uploads/1/3/1/0/131071157/xokuputab-fiwalanipowupij-zuxazejibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/75177303088.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/hadoop_installation_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0825/files/penol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/tutinitaru.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9897/files/38438717265.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/velopajapafujemadugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/zusonu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/85654431553.pdf
    • https://cdn.shopify.com/s/files/1/0432/6195/2155/files/29078544768.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/zarebusugef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/votixuwut.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/52967038401.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008351.bin
274a294fe3cdc20cd5b754ccfbebe50dc87d8b65f6a6bc21c0d9594729a9f79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 5412 bytes
font_01_sfnt_off000095c4.bin
9a9a1674646c0d7332fcfb754d3f5ca7818e0eade70f8433941370e840716b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C4 10376 bytes

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