Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f82108c5f3bc3…

MALICIOUS

PDF

46.7 KB Created: 2020-08-23 17:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b648272d5397037e827441549d447f SHA-1: 9b96148634ac6516da977835e0f6a3ea4bc8562f SHA-256: 821f82108c5f3bc376b9352e4808c47bde2a6264e22dec21a2a0f5e448124b96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at `ttraff.com`. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to direct users to malicious content. The presence of a large number of external PDF links also indicates a potential link farm or SEO manipulation tactic.

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.com/pify?keyword=ideology+and+ideological+state+apparatuses+althusser+pdf
    • http://files.arborparkpto.com/uploads/1/3/1/4/131410818/fe74ca4.pdf
    • http://bokal.summitflash.com/uploads/1/3/2/7/132712326/derobiditijujid_fererisobas_mejefofape.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/98887687479.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/reduce_size_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/ben_10_alien_swarm_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/85554843030.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/zavuduzoduvarexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/26871035344.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/nolab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/taliletilepoxekibunod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/mini_chopper_plans_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4868/9050/files/vscode_format_code_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/62330679950.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_off000078cb.bin
8727d43068af7a6d9bdf7fa2d91463e7135a0088ac6b8f45ef2018dfc64319d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 5456 bytes
font_01_sfnt_off00008b57.bin
58b90acb7a92d0dfd4e3dc1abf783443ee97e21479d64245b67813d646795ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 9964 bytes