Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67aaf1634422609…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 00:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2df363d97a27928992a9c4a5bdd95ce0 SHA-1: 01fd79692430955f4a329cee9f9800e2e2461e01 SHA-256: f67aaf16344226092d9444ef454c30357d973a3a8556cff669e53d4cd2a056a4
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious IOC is the redirector URL, which is likely used to lure users to a phishing or malware distribution site.

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/wix?keyword=tipos+de+monitores+y+sus+caracterist
    • https://static.usrfiles.com/ugd/b8c837_a23b6ba8c2334f3d8b7f48d618d097d6.pdf
    • https://static.usrfiles.com/ugd/a91264_4c2972fbd1e14e8b857d98e3c5ec0eb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41429a1127d412aaa97870cbc82fe1f.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/wuveguremoxogebazuzuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/lotudapotatepinediluf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/bdo_leveling_guide_59-_60.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/zekudesadapajori.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/54292224559.pdf
    • https://static.usrfiles.com/ugd/b8c837_083492c2e89a4c3b96d5e0ab96b34c90.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_a6fbee91620948849402c7c12f82df80.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_off00006373.bin
ace41961102c34fc29c18dab7a75db9aa0654e4132cff4602dea965eed69bfb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 5240 bytes
font_01_sfnt_off0000752c.bin
078512ee658c1490965febd8ffc759fddbcd16fc29298821b315e870f9ff4a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 13588 bytes

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