Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d85d816a6cb1c59…

MALICIOUS

PDF

45.1 KB Created: 2020-08-08 10:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c25f42db3bfd0885c896a83c21a04e SHA-1: 1f53253318456e7e32ae23f7cc7779fe1eb2df40 SHA-256: 2d85d816a6cb1c5976084fba08e5be6632b10177f59cfae0549e6341c649ee93
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.cc. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs hosted on platforms like Shopify. The ML classifier also strongly indicated maliciousness. The primary intent appears to be redirecting users to potentially harmful content or engaging in SEO manipulation through a large number of outbound 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.cc/pify?keyword=riesgos+del+modelo+neoliberal+mexicano+arturo+huerta+pdf
    • http://files.nyimafoundation.org/uploads/1/3/1/3/131381712/jadenezixirifepanove.pdf
    • http://files.musicinme.la/uploads/1/3/1/4/131483336/velidisot.pdf
    • http://files.chimachancreations.com/uploads/1/3/1/8/131871569/lonaxixedokoxam_dadopituzaguli.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/71344867970.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/didewidasarerimazipaza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/wigutosopabase.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/spatial_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/polebujuzutiwavewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/51628021179.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/verodegoloreno.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1511/files/nativogovadagulasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/global_business_today_8th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/definition_of_physical_bullying.pdf
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/79168857302.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_off00006c05.bin
c30de45cd2194dd944b6eb7c7ecd8131aea7b1706f7bbd6a160a0cb203971f74
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 5784 bytes
font_01_sfnt_off00007f8f.bin
a85858c148541d38bf3332619f8a529e2e9c3de64c61c9b53ff654d0ffef1a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 11512 bytes