Malicious PDF — malware analysis report

Static analysis result for SHA-256 766a69ea92bf9aff…

MALICIOUS

PDF

43.7 KB Created: 2020-08-23 22:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c3922e648e223092ad2d4e32022205 SHA-1: 35f17da9304cbc94df515b3a68272b550493acf5 SHA-256: 766a69ea92bf9affe9decaf0446db327eddc12ed38503e506110976734356fb7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. The presence of a link farm heuristic further suggests an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=film+streaming+subtitle+indonesia+lk21+indoxxi
    • http://files.crossroadsconsultinginc.com/uploads/1/3/1/3/131379696/3ee84f4a89.pdf
    • http://files.jon-morrell.com/uploads/1/3/0/8/130874097/1289180.pdf
    • http://files.refugieesetdeplacees.com/uploads/1/3/2/7/132740234/4523934.pdf
    • http://files.midwestbooksellers.org/uploads/1/3/2/7/132740260/de7e07ef9b6a29.pdf
    • http://files.avensys.co.kr/uploads/1/3/0/7/130739712/sobezad_kovagegovi_xigazuxa_titoxezikoviz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/91134522466.pdf
    • https://cdn.shopify.com/s/files/1/0433/8905/9228/files/bedazosatavutajuvamevede.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/2152532009.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/woripi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/13917703882.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/99952531607.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db4.bin
5f7e425262d4149ae5d2035ad75d5b1e48189dfa3603d08117a28a144062cda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5556 bytes
font_01_sfnt_off0000707c.bin
3f3b0c71dd56ef6a7aa0b0deb5b5a633af846e577b6f9a11cf95717f7ccc5788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 9932 bytes
font_02_sfnt_off000092ae.bin
a92d53be2a505522792bbb430c41768d846e915e03a7398bde40c34601cdf34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AE 3876 bytes

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