Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c81cf046ff76ec8…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 08:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0958ac501c845efa4b7368d0dca809e0 SHA-1: 86384c26ce2424cbfa5edb0cd284a6e3b5f1e57a SHA-256: 0c81cf046ff76ec806703f7cabe6afb7ad8c7a4c0044e7448a79df02dff03df1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a malicious redirector link. The primary malicious URL, 'https://ttraff.ru/wix?keyword=no2+molecular+geometry+bond+angle', is linked to known malicious infrastructure. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or lure users to malicious sites.

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/wix?keyword=no2+molecular+geometry+bond+angle
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/93c935_516a587253994a1fb2767246aad25a9c.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_33157e4ec98548f0abf67911f12e64cb.pdf
    • https://static.usrfiles.com/ugd/3f4b99_f7216c7ec5524ec8a07c8b5fc6b08239.pdf
    • https://static.usrfiles.com/ugd/7f16bd_8b9622f323004b6cb96601471ccfc250.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/socialism_in_europe_and_the_russian_revolution_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/accuweather_myrtle_beach_sc_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3733/files/nageson.pdf
    • https://cdn.shopify.com/s/files/1/0437/9806/9410/files/fapifusuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/62193858987.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/73688769788.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_off00005a83.bin
766a6400b28f74e75774606a4c0661d9290b6a95189ddf990c6d852d0e2d9e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A83 5424 bytes
font_01_sfnt_off00006ce6.bin
25ea7c2e55a6d7672ed39d9e15ee67a537be12940e63d8dd82072ea57bd78190
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE6 10120 bytes