Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ef2a2bbcaaaae…

MALICIOUS

PDF

59.7 KB Created: 2020-08-13 16:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b278bbc9068b08f861d60d2b19bad38 SHA-1: d86f6f658b744a155ca298aec4909e415d2502f4 SHA-256: 5a8ef2a2bbcaaaae4b60ae3cc0d1ab3a2ffe27fed4e7a6dac157e5371b067d69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to a link farm designed for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, contains references to the same recipe-related keywords found in the malicious URL, suggesting a lure to drive traffic to malicious sites.

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/wb?keyword=chole%20bhature%20recipe%20in%20marathi%20pdf
    • http://ruziv.hisfeetdance.com/uploads/1/3/2/7/132712615/wuziwotuwime_vuzer.pdf
    • http://files.southshoreguttermonkeys.com/uploads/1/3/0/7/130776542/zimir-ziveretinazipif-bigozal.pdf
    • http://files.inserviceeng.com/uploads/1/3/1/3/131384335/2b2bcd5af49.pdf
    • http://files.kimrichardsart.com/uploads/1/3/1/3/131380756/poraloje-robagolofovojid-lijovow-sitateribisikef.pdf
    • http://wukanip.visionillustration.com/uploads/1/3/1/4/131453850/bupelunur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/37476229583.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/12193594281.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2961/files/2006_gsxr_1000_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/9190047216.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1158/files/lileriworajuluduzabaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/minuwuzelit.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/kaxituvapirebuzesiwevufim.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7792/files/project_management_assignment_example.pdf
    • https://cdn.shopify.com/s/files/1/0448/8429/5847/files/beginner_test_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/advanced_analytical_geometry.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c0d.bin
f3fd42be214319647059cd7f05cad6311566c06a8b2fc37cdd45257876929783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0D 5260 bytes
font_01_sfnt_off00008dbb.bin
a5bc983e6ad299963a4b342518b08f4a1f8a74189940e3c0e4055c19ccc67c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBB 10428 bytes
font_02_sfnt_off0000b1c2.bin
bf3bc39413d15532c32ad9705368a0a4fb1b7008c7d6ce02429e8525b213d07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 15464 bytes

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