Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df389d990e81f6a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 23:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87509a8406db0025b2fef43bf06771ca SHA-1: cf951d4970f69094c9e537855b4c7afb88fb549a SHA-256: 6df389d990e81f6a4c586bd7b10860f69009c3f38644d356cbfd657a3ba34c05
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness. The document body, though obfuscated, contains text related to customs declarations and includes the malicious URL, reinforcing the lure. No scripts were extracted, but the presence of embedded URLs and the heuristic firings are sufficient to infer a malicious intent to redirect the user.

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/pify?keyword=china+customs+export+declaration+form+pdf
    • http://files.mollywinter.com/uploads/1/3/2/8/132815050/d35ae.pdf
    • http://rudar.universalpatches.net/uploads/1/3/1/6/131607062/bikajeguzimosenipune.pdf
    • http://files.aera100.net/uploads/1/3/0/9/130969154/2275ffc.pdf
    • http://files.cveducators.org/uploads/1/3/0/7/130775145/rotevogumotujow_bibazuzeju.pdf
    • http://files.anastasiasmitharts.com/uploads/1/3/2/6/132695574/e05a6fabae054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/30166076130.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/40336681469.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/56649733702.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8737/files/nujapoxamilawazeko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/37811756016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/augusto_roa_bastos_cuentos_completos.pdf
    • https://cdn.shopify.com/s/files/1/0436/0188/7396/files/59131865835.pdf
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/passover_haggadah_hebrew_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/mysql_safe_update_mode.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/marakaligomuban.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/lomazejakepi.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_off000064c1.bin
5105e9d0fe9ac388660e856cbde795b242601a0f4634a0911b025793c166caaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C1 5368 bytes
font_01_sfnt_off000076cf.bin
c2cae6e7986c2f942e7e8793ba2d7e6e19f1d0e8b39f273088c7a60304d22c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CF 10428 bytes

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