Malicious PDF — malware analysis report

Static analysis result for SHA-256 6418482cedc2a3d2…

MALICIOUS

PDF

44.0 KB Created: 2020-08-21 08:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66c5b19a2b86cf38d05dd4f1b0204104 SHA-1: 0c9a3c868fb6430d99c3b47418bb32f1934f183d SHA-256: 6418482cedc2a3d27fc637a92642a63402cfaf2acb38a4ffd2deba869f28e94e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a lure for an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It embeds multiple links, one of which, 'https://ttraff.ru/pify?keyword=aeromedical+services+information+management+system%2528+asims%2529', is flagged as a malicious redirector. The PDF also functions as a link farm, directing users to numerous other PDF files hosted on Shopify and other domains. The ML classifier strongly flagged this PDF as malicious.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=aeromedical+services+information+management+system%2528+asims%2529
    • http://tisoz.optimalacademyinc.com/uploads/1/3/0/8/130814328/b0631ffcfc2a.pdf
    • http://files.cateringbyandy.com/uploads/1/3/2/7/132740763/55b785.pdf
    • http://files.toyonliterarymagazine.org/uploads/1/3/0/8/130874284/6ba64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/65862149879.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/zapaxakotiguditeba.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/daxasetuxalunim.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/82330570728.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/case_580c_backhoe_operators_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/xadovogevidet.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/geluxibiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/feduzejud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/71223740246.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/pikiwiliregikufe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006385.bin
25b54d8cb055854c008ad920d75070c7a77f0d4cf3bf01f36acffdfbd5e0fa8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 5644 bytes
font_01_sfnt_off000076ba.bin
7afa1c81181686bedcf466d293c0266c705548b9a7fc53934214969410fd8073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BA 14144 bytes

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