Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda2e5386b03bd4…

MALICIOUS

PDF

46.8 KB Created: 2020-08-13 01:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f775cca0b79c7295a099c74bea75263c SHA-1: 4fbd92cb35ba4a5e502d823e80d8ef952494e66c SHA-256: 3bda2e5386b03bd4b855588e66f680aa871eb9033949fec850fd8641a248c1c2
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL https://ttraff.cc/pify?keyword=belong+to+you+vi+keeland+pdf+espa%25C3%25B1ol, which is likely used to redirect users to a malicious site. The presence of a large number of external PDF links further supports the attack pattern of a link farm designed for malicious redirection.

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=belong+to+you+vi+keeland+pdf+espa%25C3%25B1ol
    • http://files.compro-it.co.nz/uploads/1/3/1/0/131069781/tuzidigilot-dixux-xofoliw-lunagotenez.pdf
    • http://files.bunnyandclyde.com/uploads/1/3/0/9/130969971/bejato.pdf
    • http://wisuf.anapuigrealtor.com/uploads/1/3/1/4/131407406/979108.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/14802809430.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/4205396862.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3895/files/starburst_soccer_tournament.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/craftsman_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/47051073732.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/joxilejemumimugagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/91438753719.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/dictionary_arabic_to_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/np246_transfer_case_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/xanekogol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/jilawijusen.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/folazigonuredem.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/36076590988.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_off000073cb.bin
36fd76526188051e262b2ce1071e4f0c9d689df33b773f9933693e44b7656198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CB 5600 bytes
font_01_sfnt_off000086cb.bin
8d61adfa028e73904b54893acbf0ca361faa921338bcbcf3e1ea082bd5fafa7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 11040 bytes

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