Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded14c0f154cb3e9…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 20:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ba71dca8885daf077ac12858f47342 SHA-1: 3b2e32858f52735121bd2a31336af7d01663c433 SHA-256: ded14c0f154cb3e987693607750cac8c579174df2eef72c79322db261f14c8ee
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to `https://ttraff.me/wix?keyword=kaplan+cs+book+free+download`, which is flagged as a malicious redirector. The document body also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm designed to improve search engine ranking for the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=kaplan+cs+book+free+download
    • https://cdn.shopify.com/s/files/1/0446/0321/1940/files/kenmore_elite_he3_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/vcredist_arm._exe_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/how_to_add_a_user_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/nerofuwixoluketa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/chogada_tara_garba_whatsapp_status.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/43226149378.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/wisufid.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/aldus_pagemaker_5._0_software_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_8754827eb2ac47299b48b9a1d097bc68.pdf
    • https://static.usrfiles.com/ugd/9421c8_1a161b25c14d4a8784e966fed105fff2.pdf
    • https://static.usrfiles.com/ugd/87a178_7ef8838cf9ff4cdcb758fd978da6993e.pdf
    • https://static.usrfiles.com/ugd/db93e9_6afe8ce33b724457af1b426f4b2fb257.pdf
    • https://cdn.shopify.com/s/files/1/0463/0672/1957/files/wubevaduzixabigomaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/beginner_russian_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/dusipajagebofuvofor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/75049319584.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8185/files/votorivofofupedem.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_off00005d2a.bin
619bb0dfd72aca6a791530217a53ebd3b6afc7af55a21a26345648392e227493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2A 5412 bytes
font_01_sfnt_off00006fa4.bin
0ebddf7e3384c9c79be0600df84e27fad7731cfa9e882c8b63bfac0149091284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA4 10992 bytes

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