Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f85bc81ea2497d…

MALICIOUS

PDF

38.3 KB Created: 2020-09-10 03:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99acedb6757f1f31b3d8ed2443ab45e SHA-1: ced21af713bc35c8f46f81dbca09d75a9cccf747 SHA-256: 50f85bc81ea2497da39935923b36d2bc38a2b1c4ad0b77facfe7d4302be052a3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=ad+blocker+for+android+apk'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=ad+blocker+for+android+apk
    • http://nogogego.bloomcreations.ch/uploads/1/3/0/8/130814058/1344735.pdf
    • http://files.zoecoach.com/uploads/1/3/0/7/130775977/bexijumuba_xegapixalaboguk.pdf
    • http://files.robertbuxtonpianist.com/uploads/1/3/0/8/130873996/2273992.pdf
    • http://files.chrissymacband.co.uk/uploads/1/3/1/4/131453559/3b2957.pdf
    • http://mimotek.oceanaparkwelshstud.com/uploads/1/3/1/0/131069899/tekusud.pdf
    • https://static.usrfiles.com/ugd/e4ee87_bf113daa86da4b82a482cf412b712bae.pdf
    • https://static.usrfiles.com/ugd/dba42a_638acfb63b964a0b809a10f9cd96b98a.pdf
    • https://static.usrfiles.com/ugd/b28561_9b1077e11f774f1f8bda40e2e630b260.pdf
    • https://static.usrfiles.com/ugd/8c0e65_1e03412971d64c88bb5d5b5ba6efcf87.pdf
    • https://static.usrfiles.com/ugd/97493d_112520da96ff4fda9e748b8ca51a8170.pdf
    • https://static.usrfiles.com/ugd/05900a_55229dec78644f61923f45a7054c912f.pdf
    • https://static.usrfiles.com/ugd/33c377_ebf2b31858644afbb4ccdd97bc47938d.pdf
    • https://static.usrfiles.com/ugd/3b0c81_6a34de6227814484a2237502ef3b7544.pdf
    • https://static.usrfiles.com/ugd/e33828_e3f3d46a14f24c8ab549360a97fcf290.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_off000058dc.bin
5fa2995032a81f8981ca3589bb18bb276279d34c1e7fc1f46ab634266fea334e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DC 5164 bytes
font_01_sfnt_off00006a78.bin
455959a56781dd5800a8a42dc853eeb04e239d1150bb1bc6e67f67b59dc5214c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 10016 bytes

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