Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5e51c9c832ee10…

MALICIOUS

PDF

47.6 KB Created: 2020-08-02 21:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1a65f649fcb6423713bed893a0a1a2 SHA-1: 78b4b1a523e3f91bb88b4066fc485e7fc4f6fc31 SHA-256: cb5e51c9c832ee105e9af6cbc20d08627e30e94d5dab283bac0deee1fd2ec464
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, 'https://ttraff.cc/pify?keyword=hirth+f-+33', points to a known malicious redirector. The document body contains obfuscated text and multiple URLs, suggesting an attempt to lure users to malicious content. The presence of numerous links, including those hosted on cdn.shopify.com, indicates a link farm strategy, likely for SEO poisoning or distributing further malicious payloads.

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.cc/pify?keyword=hirth+f-+33
    • http://files.elementsoflifeinstitute.com/uploads/1/3/1/4/131407890/wigepidifolutenilin.pdf
    • http://files.sportpic.co.il/uploads/1/3/1/3/131379875/2797169.pdf
    • http://files.doaneyip.com/uploads/1/3/1/6/131606494/e4d78cfd.pdf
    • http://files.ihmcenterforliteracy.com/uploads/1/3/0/7/130739614/20a66.pdf
    • http://files.lauracarolyn.com/uploads/1/3/1/4/131436956/755319.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/21863379609.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/takuxuximuguzojikow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/rarixirilonujozisevoriji.pdf
    • https://cdn.shopify.com/s/files/1/0435/0692/5720/files/unity_git_ignore.pdf
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/mechanical_split_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/penivodejumexakaxekova.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/13466099880.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/reciprocating_saw_harbor_freight.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/50790457502.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/89899697414.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/belowariwalizazavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/30682476604.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_off00007182.bin
e1b6b9bf328341d5e35c6cc41f523d904d4f00d88fb0b66ae0e30a49bf562920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 4592 bytes
font_01_sfnt_off0000812e.bin
d0ed78567abbe737299bd659f223da3793cb959373124895d38c3fb5d3af87d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812E 15412 bytes

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