Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fbaaa9692e6581…

MALICIOUS

PDF

47.0 KB Created: 2020-08-15 01:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097a554e7c5801a62d750947a9d1db1f SHA-1: 6ceeb91c66c5f4864acff2ed064a591c68ae0bb4 SHA-256: 69fbaaa9692e658186781d34204ffbad0423162537c64ece0af040534002863a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic. The presence of a large number of external links, many pointing to Shopify domains, suggests a link farm designed to obscure the ultimate malicious destination. 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.com/pify?keyword=assistive+touch+pro+apk+cracked
    • http://xoluwak.thegoodfeelinglife.com/uploads/1/3/1/6/131606419/5123153.pdf
    • http://files.studiob-e.com/uploads/1/3/2/6/132682852/55b19f7.pdf
    • http://files.firsteatright.org/uploads/1/3/1/4/131438073/6159626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/thrust_bearing_skf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pathfinder_familiar_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/ponuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/54556870584.pdf
    • https://cdn.shopify.com/s/files/1/0435/2045/8906/files/78941330356.pdf
    • https://cdn.shopify.com/s/files/1/0431/9330/3199/files/larson_precalculus_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/relative_clause_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4665/6408/files/ganugaraxapawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/sugezite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/benim_hocam_corafya_konu_anlatm.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/jeromagawepabobibipa.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662a.bin
5ed0ffbbe54032a030050e1e153a2380a9497d057c74f1a20e0c977e1e0432a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662A 5240 bytes
font_01_sfnt_off000077fa.bin
e19399cb0f77a7c23a8984f1d73834faa58ffce4a2ce749d02326d60576fcfce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FA 9892 bytes
font_02_sfnt_off00009a01.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A01 16092 bytes

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