Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaf49849f590c11…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 00:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda041b38fa314ef5010372a3b4874dc SHA-1: a91233791376443d5aff59492fc115597fef4dbe SHA-256: ccaf49849f590c11281961a5485d10ebb8f187677374c33fe4937e6a51bf4bc9
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous external links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=apache+directory+studio+tutorial+pdf'. Another heuristic indicates a link farm, with many links hosted on shopify.com, suggesting an attempt to manipulate search engine results or distribute malicious content through seemingly benign domains. The document body is heavily obfuscated and contains embedded URLs.

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=apache+directory+studio+tutorial+pdf
    • http://files.leef.org.uk/uploads/1/3/1/4/131483005/322525.pdf
    • http://files.anjoybaskets.ca/uploads/1/3/1/4/131407511/jatar.pdf
    • http://files.bringmorehappy.com/uploads/1/3/1/4/131454355/50bca6bb3839ba1.pdf
    • http://files.hemingfordharvestmoonfallfestival.com/uploads/1/3/0/8/130814475/6946291.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/35621455097.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/xivituxaxetedeli.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/mercy_seat_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/tree_implementation_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/nurab.pdf
    • https://cdn.shopify.com/s/files/1/0434/4905/7430/files/farmacologia_veterinaria_antibioticos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/koloxenuwulasazutejobuviv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/mivutotagobetugiwokuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/mathematical_physics_by_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0432/0844/2020/files/nubavizukekomakixekotikej.pdf
    • https://cdn.shopify.com/s/files/1/0432/6208/3232/files/76338681827.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/41132488246.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_off000064cc.bin
f4b78c2fe15e6cc57a84a93f5adb18da2e1bb8057947361393f90f7a20cc7dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CC 5336 bytes
font_01_sfnt_off000076f4.bin
70ebfedad1651be01efcb429b3dbfaead668ead4260ded20a2fa885788dc6960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 14048 bytes

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