Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbcc12573c9897…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 04:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c23e187161c7004e15d23c38144953 SHA-1: 810e63ce2a5252d2f2cbfad9e4d00fd488214802 SHA-256: 91bbcc12573c9897bfddac625bdfcde200f317cc9e89423c80872b90121259a2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=ejemplos%20de%20curriculum%20vitae%20sencillo%20pdf'. The document body, though heavily obfuscated, also contains this URL and other links to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.ru/wb?keyword=ejemplos%20de%20curriculum%20vitae%20sencillo%20pdf
    • http://files.latitude44yoga.com/uploads/1/3/0/8/130873728/eaad598da161d.pdf
    • http://files.cuddlekidshome.com/uploads/1/3/1/3/131380263/miber_jelisinoxem_raxovikelubow_juwofof.pdf
    • http://files.detroitautocircus.com/uploads/1/3/1/4/131453896/195b717607a2ae.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/marazikomepekirinojoba.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/information_system_in_banking_sector.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/kazolazan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/nebidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/37776614276.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/juwafunoxazodoparidim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/28716424940.pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/google_classroom_training.pdf
    • https://cdn.shopify.com/s/files/1/0431/6220/6357/files/jensen_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/sevibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/90041950189.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7810/files/datewefatados.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/zuwutowesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4167/files/australian_open_tennis_2020_draw.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_off00006c42.bin
672062c2525377ee94e2e4909180de89737b21c66ab1c0c61b9d02562707c115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C42 5392 bytes
font_01_sfnt_off00007e96.bin
12364bec4acab7701bef1deaa5dde0f20ecd0602bf3663e1e263051e8304f914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E96 11124 bytes

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