Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbdb228e8e8da7a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-07 15:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2898daae8e7dbc6d2e0888eeb8fd7ab SHA-1: 48361e39b8a28a22756f981c179bec4b5ae079e9 SHA-256: 9cbdb228e8e8da7ab9b8a02e823412ff3ea8996d1f23e839fde2c46a664c759f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. This suggests the document is designed to trick the user into visiting a malicious site, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/pify?keyword=apc+ups+750va+pdf
    • http://files.keygoatfarms.com/uploads/1/3/0/7/130776619/gafas_zipebapa_dajododad_ketimugum.pdf
    • http://jixejinaf.endri.org/uploads/1/3/0/7/130775350/5ef6588a.pdf
    • http://files.erocmusic.com/uploads/1/3/2/6/132696465/zeravowavi.pdf
    • http://files.marilynfraserart.com/uploads/1/3/1/1/131163833/6458fe8aacaf.pdf
    • http://files.caitlindemeyere.ca/uploads/1/3/0/8/130813489/62614eaacdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8167/files/30500497997.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/81817462853.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/37476257010.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/sees_easter_candy.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/bakunin_kitaplar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/51744694579.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/heavy-_r_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/bumasulimud.pdf
    • https://cdn.shopify.com/s/files/1/0445/9102/2244/files/subject_verb_agreement_grammar_rules.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_off00005425.bin
ed9e4f937677037cabd71f137ae3c292d71e92d061eedca5d9e9a59e27f92a22
pdf-font-stream PDF embedded font (sfnt) at offset 0x5425 5416 bytes
font_01_sfnt_off000066c0.bin
25b169b9d64f794bb1296a7103588c7ad4b895acf577cc2f51beca3307151e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 13704 bytes