Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cedbe2dd6c175e…

MALICIOUS

PDF

46.0 KB Created: 2020-08-15 17:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48f99792f91346f894a914c29ccb504a SHA-1: ae538b6455551b655ccee5bee5eb094786641d01 SHA-256: 77cedbe2dd6c175e4749801542995bb82d61c76639eefc7a23a2dc0b4ec24065
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and another flagging a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes keywords related to 'gear speed reducers pdf' and the authoring application 'wkhtmltopdf', suggesting an attempt to manipulate search engine results or lure users with deceptive content. The presence of many Shopify-hosted PDF links, some marked as benign, alongside the malicious redirector, indicates a complex link farm operation.

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/wb?keyword=reductores%20de%20velocidad%20de%20engranajes%20pdf
    • http://files.pameladvorakblog.com/uploads/1/3/0/7/130776268/bifekow.pdf
    • http://files.austintatiouseats.com/uploads/1/3/2/7/132712209/ninaku.pdf
    • http://files.movingcompanyokc.com/uploads/1/3/1/1/131164095/roxutakaladi-relegox-duzimuvub-seralojubipoki.pdf
    • http://files.chrissychristian.com/uploads/1/3/0/7/130776743/4448540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/sagazimubapowegot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/nupetidolarewepele.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/93957476739.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/25838314673.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/36522501619.pdf
    • https://cdn.shopify.com/s/files/1/0435/7046/2883/files/68446384772.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/11127293517.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/wurogarewovu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/24010944170.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9903/files/lowes_anniston_al.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/set_precision_c.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/sumavefet.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_off00006690.bin
bd28f2f9b181149eede65545b00171906d1c9a49ce783aff713cb598c8dc81f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 5464 bytes
font_01_sfnt_off00007946.bin
9ae39c4409faee8c79dcaff76687130f6cb415b41b4c334ceb8737f45f2c6abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 16128 bytes

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