Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66753d34ceebc67…

MALICIOUS

PDF

58.3 KB Created: 2020-07-29 16:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3573796a7d88cc470ae5c3275302d818 SHA-1: 011864fc33ba3f52c016b3e6225490a71a78b2e2 SHA-256: c66753d34ceebc67332395c3fe45f546976fbe8b2a9d0acdb2ed3217e17d7c04
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 multiple embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=basel+ii+pdf'. Another heuristic indicated a large number of external PDF links, with 'https://cdn.shopify.com/s/files/1/0436/1771/4334/files/27649751826.pdf' being the first identified. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly suggest a link-farming or redirection attack.

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=basel+ii+pdf
    • http://files.bishopwoodsschool.com/uploads/1/3/1/4/131453214/moduboweg.pdf
    • http://files.wilfried-bergerhausen.com/uploads/1/3/0/8/130814101/simoronib-pemifusakanab.pdf
    • http://files.threeblockmodel.com/uploads/1/3/1/4/131437311/daponevem.pdf
    • http://files.infantswimoviedo.com/uploads/1/3/1/3/131384208/9550787.pdf
    • http://files.infantswimoviedo.com/upl
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/27649751826.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/nogumolafivasogamoxomupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/midajusoxoruxavixanefiwob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vexib.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/xupenapujaxuwidukamabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/74036959111.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/lelulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/90717524536.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/riraxupajofulozunifukube.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.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_off0000a8e1.bin
fa25c07241e393affd5408f532dfe049f9bcf2c33ac9db418a7943285f5b01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E1 4480 bytes
font_01_sfnt_off0000b815.bin
9d713e08368e242bea25d6d719d01657f0c927b054c73d26017620f65151534f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 10580 bytes

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