Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4d9fdf94262a58…

MALICIOUS

PDF

63.3 KB Created: 2020-08-25 03:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd23c2c6be7c680cfd39cd755d6e0a8 SHA-1: a1d568804d781f3a31a8ff9bac9559106b539382 SHA-256: 5f4d9fdf94262a580e89f5a3ec93a033071f95d40733ec9464c1616dfeba24f9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure related to email templates. The presence of a link farm and a payment redirection lure strongly suggests a phishing or business email compromise attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=email+template+builder.+net+core
    • http://files.streamriffs.com/uploads/1/3/2/3/132303374/mifob-sidet-zetekotoraw.pdf
    • http://files.hypnobabiescoloradosprings.com/uploads/1/3/2/6/132681851/7443406.pdf
    • http://files.cidangelcarpetcleaning.com/uploads/1/3/1/3/131378838/fekolezegonitez.pdf
    • http://sosavad.cathclip.com/uploads/1/3/2/6/132681670/c4b789c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/kagomitovopewezupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/50698791526.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/56404707721.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/spread_spectrum_and_multiple_access_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/wimoruzufikilakojowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/ibps_clerk_2020_official_notification_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/zefotobivago.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/32156584604.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/bafufelavifipudavegivi.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c41.bin
8223b27afacacd5989745e25800db2b54128d7f2315161d6bbaf096ca929ff0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C41 5168 bytes
font_01_sfnt_off0000adaa.bin
e0bd8a555cfd8b57268b8a23942bd9d5905e36d7d7a95a3133a4189fdc4ffae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 13828 bytes
font_02_sfnt_off0000da3f.bin
f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16344 bytes

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