Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a652017f3182e6d…

MALICIOUS

PDF

67.0 KB Created: 2020-08-08 02:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e720ebab4170d76b9e48a9df6a7e8469 SHA-1: 89e4852947f91882683446f1113fbe53be553df3 SHA-256: 5a652017f3182e6d688231bec7ef0b4ca6cf1eb001d9e836fa6a8b587dc9b5c5
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to a URL related to 'stripe api get invoice pdf'. This, combined with the 'Fake invoice / payment lure' heuristic, strongly suggests a phishing attempt. The presence of many external PDF links, including those hosted on Shopify, indicates a link farm used to obscure the malicious destination. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=stripe+api+get+invoice+pdf
    • http://files.hiveappeal.com/uploads/1/3/0/7/130738790/3568454.pdf
    • http://files.craftworksmusic.org/uploads/1/3/1/6/131637562/gaduzikurufakox.pdf
    • http://files.gabeeyrich.com/uploads/1/3/1/4/131452836/lareta-paduromede-lomalovumuko-vefupopefasos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/39050997018.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/xodukixaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/pumaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1636/3927/files/neropokogonezefogugemareb.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/gixijuzakagaxizozevimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/26015304183.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/46926223624.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/92453829327.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/69535615024.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/bajirozene.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000974f.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x974F 6744 bytes
font_01_sfnt_off0000a836.bin
4c3dd217490f7ef08eb6827fe61c28cdec68f2602ad62b225ac277fd473b91f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA836 5276 bytes
font_02_sfnt_off0000ba3c.bin
2caeb454a93b18584067451a2b12acb77e4a50455da74f41c574601843ce0219		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 1648 bytes
font_03_sfnt_off0000c280.bin
5278b5ec37f9b41b169e6c6c3897902fea25974618c5e0af4d318e9f6b4857b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC280 11492 bytes
font_04_sfnt_off0000e7d6.bin
6f7bc4eec37da449db3f34df247bbfa240814524d58031c0d1c1dfccc9d65a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16340 bytes

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