Malicious PDF — malware analysis report

Static analysis result for SHA-256 611de59ee572e68f…

MALICIOUS

PDF

98.1 KB Created: 2020-08-12 04:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22dfbd3fcd1ec17e09868bc878215de3 SHA-1: 2179cd752c0fc395088211308d2771819f616b9d SHA-256: 611de59ee572e68f3a44f2dbc2eb69c09e660196812b3e3acb4a55b3e58656fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a printer manual, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links and the overall structure suggest an attempt to redirect users to malicious 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.com/pify?keyword=bizhub+c308+manual+pdf
    • http://files.morganraebrown.com/uploads/1/3/0/9/130968967/7339162.pdf
    • http://files.yashbangera.com/uploads/1/3/0/7/130738625/83486b04a35.pdf
    • http://files.slackkeymusiccenter.org/uploads/1/3/0/7/130776445/1da258.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/pavedogaladinaxodotutipuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/avadhanulu_engineering_physics_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/jogexesawomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/kexefikenepajobun.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4037/files/litewoligesedasij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/37088684429.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4297/files/online_to_ppt_converter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/applied_partial_differential_equations_haberman_5th.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/buwukepenarunowara.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/40130841530.pdf
    • https://cdn.shopify.com/s/files/1/0435/4388/8023/files/kowikerulipi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134f1.bin
bf72ea64b0405627a55794bb5526bce25aed2d4c2055e66380b4770b29473f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 5860 bytes
font_01_sfnt_off000148c8.bin
ea7085dad69df2314eacbcb7d0ae774391db6a93932b3f3dac8563d794f436da
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C8 16608 bytes