Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ac6a5a7f1db6b4…

MALICIOUS

PDF

44.7 KB Created: 2020-08-18 20:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21c407784442575c726a1aa75d22a8d4 SHA-1: 58c7024c0c780b9edd5b81857912cb432059df28 SHA-256: 17ac6a5a7f1db6b40185f0118f51f4bb24e6bfd1f00611288c48b1de27261b3a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

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.cc/pify?keyword=north+penn+reporter+lansdale+pa
    • http://xalavusok.kanein111.com/uploads/1/3/0/7/130775413/1d402883f06443.pdf
    • http://wofebijun.magicalcelebrationtravel.com/uploads/1/3/0/7/130776873/fuwodomituluxatojepe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/free_editor_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/60904406614.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/74180222914.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/romota.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/24079627677.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/computer_awareness_book_arihant.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/continual_improvement_procedure_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/java_long_to_int.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/44045106002.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/manudijaxojulorabulifas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/ratuzuzizibexebitok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b90.bin
2e29652c4dce7b4a82c15a19d66eebb338135a6c4d4b4f2621ee8cff643c1060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B90 4756 bytes
font_01_sfnt_off00006ba7.bin
a89cf18315e5fd4bae81cd50528706874a005b5e3d24b625a9d057889d7e8b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 13920 bytes
font_02_sfnt_off000097cc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CC 4324 bytes

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