Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c971c907d54c17…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 13:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad86d9f3bc35597651774e7a1a12116 SHA-1: c2a57c286543e10f97087da8f88d0584e5f9e7bf SHA-256: d7c971c907d54c1798e42171973f04480c86cc8142737b3067035bdc2e3d2000
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically the URL https://ttraff.ru/pify?keyword=ksubi+denim+size+guide. This heuristic, combined with the ML classifier's high confidence, indicates a malicious redirector pattern. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be the embedded malicious link.

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.ru/pify?keyword=ksubi+denim+size+guide
    • http://files.jongunnfitness.com/uploads/1/3/1/0/131070982/vugubobuxaluruwe.pdf
    • http://files.ccpdiscoveryschool.com/uploads/1/3/2/7/132711999/tudozitariboletokas.pdf
    • http://files.thesportsforge.com/uploads/1/3/1/6/131607712/9440517.pdf
    • http://gelaremak.christ-presbyterianchurch.org/uploads/1/3/1/4/131407995/bukonamumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/48596287110.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/getting_started_with_spring_framework_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/localizar_mi_telefono_android_perdido.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4113/files/53486974186.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/anterior_cruciate_ligament_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0438/5167/7856/files/zofogeroxovugubavowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/xitizugepibarafituxetor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/38312655640.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/dizunifisifojipugotosaze.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/sole_f63_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/16916731120.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005965.bin
a8b389dd66be4cac9254d5dacee386797d8730d924ec863f13a23b44c682edd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 4968 bytes
font_01_sfnt_off00006a3b.bin
7c0cfec3ca8ede46c100650afc8a84e0984236bb6b80f3250605a265af26a992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3B 14652 bytes

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