Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f13b1336c86452…

MALICIOUS

PDF

49.3 KB Created: 2020-08-02 15:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb0b3514735cc966797d1bf6b416478 SHA-1: 5fc612c8e00c76db6a53d9d19f6f0478ce8b46a4 SHA-256: b5f13b1336c86452052a0a4c71a0088bf26768b903ef42dc66bfb83f18660324
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to either distribute further malicious content or engage in SEO abuse.

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=all+notsobot+commands
    • http://files.ultimatehomeconcierge.com/uploads/1/3/1/4/131437778/gojobexes.pdf
    • http://files.susie-carter.com/uploads/1/3/0/7/130739225/fapalovowomejipuvop.pdf
    • http://files.askewcpa.net/uploads/1/3/2/7/132710690/litopejose.pdf
    • http://files.tylersistersboutique.com/uploads/1/3/1/8/131872042/3118568.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/zudoxobox.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/rebozup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/laxuwuvulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/vimubulawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/negononu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/how_to_install_borderlands_2_reborn.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3302/files/vovomatuduk.pdf
    • https://cdn.shopify.com/s/files/1/0438/8087/4139/files/totilav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/80143931624.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/pududasogiviguzipekiriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/wasoweworites.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_off00007600.bin
40b2d58dd524051837eec61d0fc232dbc2ecc7ac05b2489f1a6a5213c51ff4be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 5116 bytes
font_01_sfnt_off0000874e.bin
795eba1348367fc826e86f2b990f3412225b949bfb008cc796fbd50ab6d246df
pdf-font-stream PDF embedded font (sfnt) at offset 0x874E 15860 bytes