Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad44fe7e458e4cd…

MALICIOUS

PDF

45.3 KB Created: 2020-08-10 23:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f800bec3be280ee3c820be2ac58164e SHA-1: ebe801df596339afd892310811d223cfd984950f SHA-256: 7ad44fe7e458e4cd1b77ab36ad258c24491cf2aedaec2cc539dfd897b4e33806
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=curriculum+vitae+pdf+format+download', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Curriculum vitae pdf format download', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=curriculum+vitae+pdf+format+download
    • http://files.nvclosedeals.com/uploads/1/3/2/6/132681647/pinopiredumuz-veviwonip-xuvigopoki.pdf
    • http://files.thevillasatpleasantvalley.com/uploads/1/3/1/8/131856173/10b65321d8.pdf
    • http://files.karmenkooyers.com/uploads/1/3/1/4/131438460/laburofal-faxuxagojuk.pdf
    • http://fokox.restorativereins.com/uploads/1/3/1/3/131398140/kowifafewi.pdf
    • http://files.pioneerfencing.com/uploads/1/3/2/6/132695732/2631813.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/rugusefiwekukodofa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/52863520529.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/86922021027.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/50916240873.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/apostila_calculos_trabalhistas_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/peroxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/74324229892.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/exploring_geology_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/83248661128.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/how_to_get_more_twitch_emotes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/classroom_management_approaches.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007419.bin
2900b0f1de9228d7e0dfa286890ecb156e317dbdb5b31ffab6896cd047a6d9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7419 5180 bytes
font_01_sfnt_off000085b8.bin
33507019104e2df2d3ef0c042d28830138fcd6b969e63f949123a556b6962f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B8 10148 bytes

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