Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1cdfe36623f967…

MALICIOUS

PDF

45.1 KB Created: 2020-08-07 22:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33346f10d0fd998a0981147c3d0a9b01 SHA-1: d9369a8ca239b275055ec12436ba1b41e046786b SHA-256: bd1cdfe36623f967c121281e91a5cd5363cc97810e3af9b8c37423767507a4d6
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=assembler+deux+fichiers+pdf+ensemble', suggesting a lure to obscure malicious destinations. The presence of a large number of external PDF links, many hosted on 'cdn.shopify.com', indicates a link farm strategy, likely to improve SEO for malicious content or to distribute the malicious links across multiple domains.

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=assembler+deux+fichiers+pdf+ensemble
    • http://files.bckamsler.com/uploads/1/3/1/3/131379375/gazatebukez_logezaril_zewexanen_kesutufefow.pdf
    • http://files.torahoutreachprogram.com/uploads/1/3/1/3/131379899/luririxitefew.pdf
    • http://files.matthewfuhrmann.com/uploads/1/3/0/7/130776265/233465.pdf
    • https://cdn.shopify.com/s/files/1/0444/3042/6278/files/2d_and_3d_shapes_worksheets_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/7349/3406/files/sewotepozabizena.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/functional_analysis_best_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/74044960915.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/majakaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5816/6949/files/ensayo_de_escepticismo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/82993800844.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/53261758020.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/gepojosifusinamela.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/29724364681.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/bomekazililebuvexekaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/nulokekidemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/duvudaxunivelazapa.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_off00006fde.bin
3d81d29f0256008549f3c0287e60e30d2ef20343f39eaa3f615cc28a16571650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 5380 bytes
font_01_sfnt_off00008204.bin
a9bacb7779a6fe964cb9f6255bb8ab9683c3d09fb53160cfbde29df6380a81b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8204 11900 bytes

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