Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ae910c8ca32b2…

MALICIOUS

PDF

50.0 KB Created: 2020-08-29 18:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29ccb6ba8e5bf648a1ebd310c2993986 SHA-1: bc10bc7a31cda4e8a2b9637fed6d6a07e221ffe2 SHA-256: 829ae910c8ca32b2032b51f15d49d9ef100afaedcb9a1159988324a12cd48200
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link to a redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains text related to 'bodybuilding program free pdf' and the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous PDF links indicates a link farm or redirection strategy.

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/wix?keyword=bodybuilding+program+free+pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/jinemulukadaferezov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/matixasesiwenul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6908/7642/files/78701393634.pdf
    • https://static.usrfiles.com/ugd/b8c837_9825a9fdc3954a0e9e0552a59b86333b.pdf
    • https://static.usrfiles.com/ugd/b8c837_800779e1ec8c49b1a275df427b97cfe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6fa9a903a1f4da1a6b4070563175ce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c99193cc0183462995fb5114baa79c59.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/98778493991.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/sinusite_bacteriana_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0429/4213/6476/files/19795723783.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/kapigerekuta.pdf
    • https://cdn.shopify.com/s/files/1/0436/3183/7344/files/74201648171.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/descargar_pokemon_oro_para_my_boy_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/7367/3118/files/bokejezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4899/1910/files/random_utility_theory.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_off0000856a.bin
0e8c0a68877d6b2b1a537aece0a76c95e7526cc576739127080bea793a83a40c
pdf-font-stream PDF embedded font (sfnt) at offset 0x856A 5476 bytes
font_01_sfnt_off000097f6.bin
292641f3e3507592ead94c3c7e4b5ed914fb400ba548cd7f6619c7c502942827
pdf-font-stream PDF embedded font (sfnt) at offset 0x97F6 10340 bytes