Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8f640867224e74…

MALICIOUS

PDF

45.1 KB Created: 2020-08-11 02:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ba0697eb0355bc5b2c45ab934fc03a SHA-1: 2f0c424cded8682a7ef2f5dd1a819418d39be56a SHA-256: 4e8f640867224e74a4ab33e89223d1018e850d6d1bfea6bf91098c2311d3fc72
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=software+defined+mobile+networks+sdmn+pdf
    • http://files.toddwyant.com/uploads/1/3/1/8/131856624/4188643.pdf
    • http://vewedove.rbreakironandassociates.com/uploads/1/3/1/3/131383791/xedujojabivelevot.pdf
    • http://files.pacificcascadefarms.com/uploads/1/3/1/3/131381919/f49353d0da7aa5.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/totobeduvoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/running_record_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/1261/0472/files/95192768421.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/12422639519.pdf
    • https://cdn.shopify.com/s/files/1/0434/2582/4929/files/no_man_s_sky_nitrogen_salt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/86148703511.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/28515515621.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/accelerated_learning_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9930/files/zojevozekokomenizino.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/bevarevitibovofezul.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/pm_awas_yojana_rural_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645c.bin
5686b88d0b22ea618ff6b614c26ce1ede721bf1439641aa6659320daea2ee742
pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 5372 bytes
font_01_sfnt_off0000768a.bin
0743f68460e6a61de47334081244fc32e204d6a12329483b1ccaf1e212c0d3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 10156 bytes
font_02_sfnt_off00009952.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9952 4324 bytes