Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b884996bacfd61…

MALICIOUS

PDF

43.3 KB Created: 2020-08-07 21:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5d8507c0f7259474c21455d9461df0 SHA-1: 5a02feaf0fdc8ee0f9027874675a202b58fd6bfe SHA-256: a0b884996bacfd616cf4036b499a6217796073c8e1a97f643f34f6f0621097e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link to a redirector service, which is a common technique for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise the malicious intent. The presence of numerous embedded links to external PDFs, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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.com/pify?keyword=probability+mass+function+problems+pdf
    • http://files.newlifepentecostals.net/uploads/1/3/1/3/131380485/xekopijowuvabawoxezu.pdf
    • http://files.dancetemplesaltspring.com/uploads/1/3/0/7/130775018/925a021cd.pdf
    • http://wowef.hidingfromjapaneseghosts.com/uploads/1/3/1/6/131637254/nolena.pdf
    • http://labifar.montanaarabianhorses.com/uploads/1/3/0/7/130776542/790b04.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/expiration_date_script.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/gofajuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/suzifig.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/1001_arabian_nights_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/lulemegujezasujelatigepod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/porulafesudugasusup.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/vodefasat.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/46623614843.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/jugojakuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3885/8650/files/67650492823.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/95228194939.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/21460081967.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/learn_excel_macros.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_off000064a4.bin
fbd45b182fc34ec0a3914e42c82416b0b2719f3d33ed53d209eced260cd832da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5544 bytes
font_01_sfnt_off0000776c.bin
ddc8937f9bbf0e4d84e9383d195679b12918d88ea7b4e111ce1886a050d9d9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776C 12728 bytes

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