Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c82fd606c8c7a3a…

MALICIOUS

PDF

44.2 KB Created: 2020-08-19 01:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f28ecaefeda29de763f3d655b2720003 SHA-1: b0c579e75e0785d71129560bb91fe4736999824d SHA-256: 7c82fd606c8c7a3a7996c47c83c2ea549f9b8701ffbd657dff863a691d934dad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the text 'Cleaning services business cards templates' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier 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=cleaning+services+business+cards+templates
    • http://files.dassiedahan-author.com/uploads/1/3/1/3/131378993/geburu.pdf
    • http://tused.mailingctr.com/uploads/1/3/1/1/131164250/3302778.pdf
    • http://jifuv.vuphiyen.com/uploads/1/3/2/8/132814742/robugapabagamoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/1964_cessna_210_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/74802135935.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/aditya_birla_home_loan_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/average_speed_problems_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/4525762842.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/levemakoberez.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7481/files/olecranon_bursitis_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/22986128719.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/piwowozifulogavetenam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8366/9412/files/82361581943.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060d6.bin
089d7cfa685162d2e24ecc2270379c0c594aa315223e8b694bdb3eac81f49af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 5388 bytes
font_01_sfnt_off00007311.bin
5732bfaaa11e4060be0949017f76eb7259405d26269fd68a01a169aada4466b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 10192 bytes
font_02_sfnt_off000095dd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95DD 4324 bytes

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