Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ac85b42955399…

MALICIOUS

PDF

34.7 KB Created: 2020-08-22 13:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d66ec80ac35e7ff63756df7e6e5c256 SHA-1: 5c588b57ac42ae70709a478f27fc620a78acec3b SHA-256: c58ac85b429553997577672fafc36723363a305c329299e30f1967a4b4ba2918
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to 'Michelin travel guide japan' and a URL that mirrors the malicious redirector. The presence of a large number of external PDF links, many pointing to benign content but some to unknown hosts, suggests a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=michelin+travel+guide+japan
    • http://kojer.naifamt.org/uploads/1/3/0/8/130874063/nokofejakos_dikuganolalir_gupuvafu.pdf
    • http://jixalimun.berkshireartsacademy.com/uploads/1/3/0/9/130969336/2325771.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/start_business_without_money.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/atal_bihari_vajpayee_poem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/a_knight_s_tale_film_analysis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/mofusiloxizusilow.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/login_page_in_php_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/ropivofuwokoregozemife.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/body_centered_psychotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/all_songs_of_war_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/kogonufituwelere.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/louisiana_believes_ela_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/90311779325.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/pesijutugijuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevesuladufutaniwor.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_off00004b9a.bin
dfe322f430c0a24b5991b9bf9cbf16a2ad3ad267ac5bc3ec8c0cce321f62c4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9A 5300 bytes
font_01_sfnt_off00005d9d.bin
d33412640f74d8484d09ccae58b6ec9b405fa301ea2aff9aa2334afcbf14e931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9D 9552 bytes

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