Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bad5cc4c012618a…

MALICIOUS

PDF

65.5 KB Created: 2020-08-04 03:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 777d4baf7cfbbc44846ae8392ec60e3a SHA-1: c501115a8806d1f7f07b552b5eed990e3d325b37 SHA-256: 7bad5cc4c012618a5514137dfb509af8573683e4973a9b406564ba6732c3e096
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, one of which points to known malicious redirector infrastructure. The embedded links likely serve as a link farm to manipulate search engine results or as a phishing lure. No scripts were extracted, but the presence of numerous URLs suggests an attempt to direct users to potentially harmful content.

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=argala+stotram+malayalam+pdf
    • http://files.rpmbusinesssolutions.com/uploads/1/3/0/8/130873943/nurotuluxomanuxiju.pdf
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdf
    • http://files.laurylgaumer.com/uploads/1/3/1/8/131871642/e8e68c6936.pdf
    • http://files.deepcreekassociation.com/uploads/1/3/2/8/132814996/33a28253942e5.pdf
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/7/130775466/f328c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/valubukiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/garifafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/46289433322.pdf
    • https://cdn.shopify.com/s/files/1/0436/4976/1433/files/proyecto_de_tesis_peru.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/ziveviluxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5954/3192/files/cutting_edge_intermediate_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/51929399681.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/resident_evil_hd_remaster_speedrun.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/ruxeduv.pdf
    • https://cdn.shopify.com/s/files/1/0439/0843/2027/files/pipuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5640/5411/files/87288386997.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_off0000acfe.bin
efba5da532ab478493210498bda8a4f692a03885a92a76cb20e8e2bd835a7709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACFE 5452 bytes
font_01_sfnt_off0000bf7f.bin
c7e8a2cccee2d0dbec4dbf8891faef44316309d21079488d0ac77abd46f13729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7F 10616 bytes
font_02_sfnt_off0000e2ec.bin
7997dc3d4b585e3525dfc0b3097758e4001cd3bd8941b7003ff105ce42a76c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 6164 bytes

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