Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4723dae0a89abaa…

MALICIOUS

PDF

44.3 KB Created: 2020-07-31 05:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f563d051ed82e35892157fdd202b894 SHA-1: 00eac6ee6068c1cda5d57e2bad9aa34146bb3e81 SHA-256: d4723dae0a89abaa43a37b875b21233206f5d18514bae40753f3818724d5d9b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous SEO-optimized links hosted on Shopify, many of which are benign but serve to obscure the malicious intent. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation.

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=intergranular+corrosion+of+austenitic+stainless+steel+pdf
    • http://files.kroungoldsfurniture.com/uploads/1/3/2/3/132302872/7365917.pdf
    • http://files.lulingicehousepottery.com/uploads/1/3/1/6/131636914/jososexomuxa.pdf
    • http://files.marieequi.com/uploads/1/3/1/1/131164260/9435973.pdf
    • http://files.lulingicehousepotte
    • https://cdn.shopify.com/s/files/1/0433/4636/2527/files/15772859763.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/fanosojurijalujisesukosil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/37776856034.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/semiruvakivegimawoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/86444250915.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/bokimameburibimise.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/41604417814.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/jagokosubifopilag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/52052856184.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/70140450529.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/73190448107.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/61280015363.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_off000070c2.bin
9e9365fd01982136f4386518f7b5b1c580a785eb77280bac85652f11a6ba7493
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C2 5144 bytes
font_01_sfnt_off00008243.bin
0722b9b638c7b9db3c4d236d4c8d6024503c750b4da716d2c3ad87ffca3e5040
pdf-font-stream PDF embedded font (sfnt) at offset 0x8243 9716 bytes