Malicious PDF — malware analysis report

Static analysis result for SHA-256 b764232d0c60946d…

MALICIOUS

PDF

37.5 KB Created: 2020-08-07 22:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0d64d6ad696f0c46f8feddeedcf21c9 SHA-1: cdaa99e61455e1d3b47cdc409970f19a87a3744a SHA-256: b764232d0c60946dfd6dc4e5cb0c7b0d6c951e28c325d96f9f7ebd1560c66d05
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Another critical heuristic indicates a PDF link farm, with many URLs hosted on 'cdn.shopify.com' and other domains, suggesting an attempt to artificially inflate search engine rankings or distribute content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the URLs, reinforcing the lure.

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=algorithm+c+sedgewick+pdf
    • http://files.geppscrosscricketclub.net/uploads/1/3/0/7/130738637/8612601.pdf
    • http://vufubivul.simplehealthnut.com/uploads/1/3/1/8/131871721/poloboxoxametag.pdf
    • http://files.shekinahgloryworshipcenter.com/uploads/1/3/1/8/131871854/2617071.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/41289693502.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/digoxajejuledimomajok.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/vopagonuxanujolazojijum.pdf
    • https://cdn.shopify.com/s/files/1/0437/8846/8376/files/vuxutiverakafudew.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/39138479090.pdf
    • https://cdn.shopify.com/s/files/1/0428/9953/8087/files/sizatolelavomenef.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/41403559150.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/pugozuzuzejupafenisiwaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/cardiomegalia_grado_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/19626863795.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_off0000532f.bin
0c14ceb5d8a8ffc8e14b66e5d4a04ff73c5f6b5600e26d6af73b3f41aa5f8d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x532F 5504 bytes
font_01_sfnt_off000065d8.bin
b741ccedf403bc4a297cae80f2f3c25024e9ef9f9ee8c974bc3b1d882388bb94
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 10500 bytes