Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143e975b4a53652…

MALICIOUS

PDF

36.1 KB Created: 2020-08-07 07:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 767627ccdfda757d87bb67aaa6b5a6cf SHA-1: 6849e452cd18f590200710eb92f492e0f674247a SHA-256: 7143e975b4a536524f72a527a3c20719981c4327d3874e2b9437aa274af84f79
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=physics+matters+textbook+answers+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other Shopify links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=physics+matters+textbook+answers+pdf
    • http://files.jpguiao.com/uploads/1/3/0/7/130776791/sadenexad_xonutife_legutuli.pdf
    • http://files.mindstatepsychology.com.au/uploads/1/3/0/7/130739996/wawasi-ruzawof.pdf
    • http://files.myactionfigurecustoms.com/uploads/1/3/1/4/131406505/4113f6d8f1d.pdf
    • http://files.wallawallawinelimo.com/uploads/1/3/0/7/130739474/133b3cb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/waxixojisiwatogoti.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/72582395461.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/ocean_basket_mauritius_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/difference_between_amorphous_and_crystalline_solids.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/saga_cazadora_de_hadas_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/93004137902.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/xalanumudumizisuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/retij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/incident_at_absalom_station_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/google_slides_dimensions.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/jurulalenoririra.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/zukew.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_off00004f2b.bin
d9ddd7e3adc997f33d1ee9eeec38e4343fbb8962f0aa2f4549d3ace7b0008dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2B 5832 bytes
font_01_sfnt_off000062ee.bin
462404b3b07896ae1b606d3c5947d579e52755b3d517c8c2290789739203afa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 9564 bytes

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