Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6cc62773dc0a37…

MALICIOUS

PDF

45.3 KB Created: 2020-08-21 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8be83718f093ac82d5ff805c1cd79ce SHA-1: b2d44121ea44860b341a5e9f05e620f8b431bd4c SHA-256: 2e6cc62773dc0a374b5d32e4e2a3150f9a8fa9c35effd303e19ad70e0f3123c1
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is `https://ttraff.ru/pify?keyword=libro+administracion+de+recursos+humanos+chiavenato+pdf`. While many Shopify links are present, one points to `http://virugeme.cluttercricket.com/uploads/1/3/1/0/131070458/6b84f79a.pdf`, which is also flagged as suspicious. The ML classifier strongly supports the malicious nature of this PDF.

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=libro+administracion+de+recursos+humanos+chiavenato+pdf
    • http://virugeme.cluttercricket.com/uploads/1/3/1/0/131070458/6b84f79a.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/gapatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/tajubakedurosisew.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/husqvarna_lgt2654_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/zedobixugupeneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/fiposetubusasuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/xizul.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/vamuretidito.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0439/0187/8440/files/zapikegomoduxiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6529/3462/files/guia_ceneval_preparatoria_2020.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_off00006d7a.bin
8fb2a09f66c0e579b461719c1ba122f434eb538768c24084a7bb4d44dfd76ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7A 5504 bytes
font_01_sfnt_off00008004.bin
e37cf91186025b6503f2f4122f8c80c008d2f8fed23593553be8c9ea2dca0060
pdf-font-stream PDF embedded font (sfnt) at offset 0x8004 12016 bytes