Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0c1d2d87440406…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 21:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a7fae97f4c19b40047e6e5577fa6111 SHA-1: 84c555efcbb6346fcc253bb01ffa8d29cdff4257 SHA-256: 7a0c1d2d8744040672830251d7940c175dcc266577f36ebccd7098399539d4d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically disguised as a European arrest warrant template. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various external resources, many of which are benign Shopify links but one is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to lead users to harmful 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/pify?keyword=european+arrest+warrant+template
    • http://wedimax.jolonbathbody.com/uploads/1/3/0/7/130776078/2040666.pdf
    • http://wolizewur.butterflyposturalchair.com/uploads/1/3/1/1/131164392/4788117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9515/4069/files/cg_scholarship_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/64394209752.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/the_nanny_season_1_episode_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/3284/5207/files/dumamudusotowuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/20258072616.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6958/files/c_convert_to.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/molebelumazunodutewuwep.pdf
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/behavioral_finance.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/99189634337.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/gilepajopibin.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/lajub.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8536/files/traductor_de_aleman_a_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/data._table_roll_nearest.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_off00006212.bin
7942bfcd42b35a870cf712df17e53cfe1668924134d6aac2cb5d40db2eeb5e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 5012 bytes
font_01_sfnt_off0000731a.bin
d2255dd7c0345de52c454705608742029b7862d8fe44da55530687eeda768668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 10020 bytes

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