Malicious PDF — malware analysis report

Static analysis result for SHA-256 d309c626da681e06…

MALICIOUS

PDF

40.4 KB Created: 2020-08-10 22:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2458c41855d6527f5cc40b44cda33908 SHA-1: 4d349c46d2274a471eb9f9b4586b40bfa08bf24b SHA-256: d309c626da681e06ed60122e7cd6b099e2cea1f6dabd31a34f3a842765562bfb
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free download, aiming to trick users into visiting a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm designed for SEO manipulation to increase visibility of malicious content. The document body, though heavily obfuscated, contains the primary malicious URL.

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=fusion+pdf+gratuit+telecharger
    • http://kumeli.castleplunkettns.com/uploads/1/3/0/7/130739385/3441febe81c.pdf
    • http://tixix.sensoreviews.com/uploads/1/3/1/4/131407406/nobokuwugekatu.pdf
    • http://buwibipav.hudsonvalleyfamilylaw.com/uploads/1/3/1/8/131871721/lesikewamit.pdf
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/riwalopofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/past_tense_present_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/grammar_games_mario_rinvolucri.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/dagisidozav.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/pepewezemogaxuzesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6565/files/38839233305.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/lonax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/pride_mobility_scooter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/31083034041.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/d_d_4e_monster_manual_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/13388799722.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_off00005e09.bin
921f526eb70b3acf3d46391c28d9658772f718067e19125711348a25082aaab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 5372 bytes
font_01_sfnt_off00007044.bin
d165482475ff7861dd5c124bb6148cb35bc95a8ff286f13380b28dbc267ea140
pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 10816 bytes