Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a3b9f3a1d2bd5d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-04 18:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8deb091f7f76b6a4ac57e48526f111ce SHA-1: 3ab99bda80a894c4d2e3cd133464067f15bb3e7e SHA-256: 07a3b9f3a1d2bd5d46f86244e66edd84fa911f479cf015b603b8206b2a33bce1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.com/pify?keyword=a4+business+card+template+pdf'. The document body, though heavily obfuscated, contains references to 'A4 business card template pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The presence of multiple Shopify URLs, some flagged as benign and others unknown, indicates an attempt to blend malicious links with seemingly legitimate ones.

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=a4+business+card+template+pdf
    • http://files.chemungfire.com/uploads/1/3/1/3/131382696/vevedutepipu.pdf
    • http://files.fumcsaranaclake.org/uploads/1/3/0/7/130739835/fekijini.pdf
    • http://files.socialsolutions4autism.com/uploads/1/3/1/3/131383045/d68ea142f2e99a0.pdf
    • http://files.southashlandumc.org/uploads/1/3/1/8/131858287/771c02fe65564.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/ximufes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/8895095739.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9791/files/66730233510.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/63473813279.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/98134912703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/74411490701.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/24988058627.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/jawagigezunoteged.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/pusafadumefukavajaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5912/files/jisigapufikubogojekuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.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_off00005bd9.bin
f3c24bdbf7d286be7d96a454387f7b073a7bbfb364962357e52e3aa1b68a2530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 5516 bytes
font_01_sfnt_off00006e87.bin
ac3e5ecae1e6981fdafad72b408f36c1aeb0e1d638b215e39bdc05d640a95fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E87 10452 bytes

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