Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f9629211021e42…

MALICIOUS

PDF

77.9 KB Created: 2020-08-19 19:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65dbc10fcc29dfdde35448927e3d68e SHA-1: 6da15e4836cc947ff387559342186fcc69f91071 SHA-256: 22f9629211021e42d2e4ffc80b76643ad87634aeb9917962a2a91407f8d6c46f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=el+embarazo+pdf'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0432/1188/2653/files/xesisefawusogusutosul.pdf'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=el+embarazo+pdf
    • http://files.techsmartacademy.com/uploads/1/3/1/1/131163590/benebamoladopijarafe.pdf
    • http://files.kelvynkoning.com/uploads/1/3/2/6/132695714/pepavu.pdf
    • http://files.juliahobdayphotography.com/uploads/1/3/0/7/130775245/zevodojesejip_nakuna.pdf
    • http://sojojub.pglargyll.com/uploads/1/3/1/4/131452836/49da10b75.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/xesisefawusogusutosul.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/wexikakunadiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/corriges_cahier_alter_ego_2_plus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/95958894692.pdf
    • https://cdn.shopify.com/s/files/1/0439/7321/4366/files/online_brochure_maker.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/pavafekilolilanedekig.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/98041643080.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1834/files/mama_bear_legal_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/73824177512.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/15302614630.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/l_anatomie_de_l_oreille.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_off0000f0e1.bin
ece3a18c9f766e183aaa9a47dbfb8dc66d189210aa593fe43c3b3f6095183201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5156 bytes
font_01_sfnt_off00010258.bin
a2c42b28d819962bfbfdbbc4819ea20bdecea9cca9a756dbe2194492a299b455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11852 bytes

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