Malicious PDF — malware analysis report

Static analysis result for SHA-256 078560ba9b9449e0…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 08:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbaae567b94950bc62a6f5d1577e9977 SHA-1: bf7814b3484bb07108a44a0b5b971e51f99a1017 SHA-256: 078560ba9b9449e02c8a73e0538a1f59f4303c75fb51bad4a97aa1b2356acc18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a link farm designed to generate traffic and potentially lead users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used in conjunction with a lure related to 'income statement format for retail business'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the embedded malicious links.

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=income+statement+format+for+retail+business
    • http://files.crazycraftcubby.com/uploads/1/3/0/9/130969614/ad420.pdf
    • http://files.latigocustoms.com/uploads/1/3/1/3/131380521/a39ef6f9.pdf
    • http://xiwalox.michellecmcadams.com/uploads/1/3/2/7/132712354/c03aca5e0.pdf
    • http://files.westchesterwomenssoccer.com/uploads/1/3/2/6/132696030/2231103.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/skyrim_realistic_needs.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/3642832258.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/43148063432.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/manufacturing_systems_engineering_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/free_printable_phonics_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/darebowuzudojepubeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0943/files/axel_fischer_amsterdam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/90892840503.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/gijiwowobareb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/adobe_reader_installer_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/49032923890.pdf
    • https://cdn.shopify.com/s/files/1/0445/9751/0308/files/steps_in_root_canal_treatment.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_off000062f4.bin
f634803734db0ef1ad85792776e48fd12e331aa399772a0a56c9cc3ab3ec7639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 5104 bytes
font_01_sfnt_off00007428.bin
3c661e5f73f6a02717eefc6a198ad397741d3ae86d9ea5214e9be257f453e31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 14596 bytes

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