Malicious PDF — malware analysis report

Static analysis result for SHA-256 985da40ba05731b9…

MALICIOUS

PDF

48.6 KB Created: 2020-08-05 02:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f28acc1b8f892e320c06ac8b0521419 SHA-1: 8116af5b82eeb47d715d34d322045e3224149b61 SHA-256: 985da40ba05731b98e47c326206c31966ee034345bdf7b9ac4f2c39e4a54c22c
120 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure for 'electrical machines interview questions and answers pdf'. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary malicious IOC is the ttraff.com redirector URL.

Heuristics 3

  • 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.
  • 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=electrical+machines+interview+questions+and+answers+pdf
    • http://files.groverclevelandhs.com/uploads/1/3/1/1/131164558/viwopese_kixasuxor.pdf
    • http://files.balloongaljenny.com/uploads/1/3/0/9/130969763/vezob-gudilujegox-fujodegafe.pdf
    • http://nivajabi.phototour.mobi/uploads/1/3/0/8/130814328/49eb7822.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/11579096492.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/19441202673.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/95827452352.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/analytical_chemistry_by_gd_christian_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/sensitivity_analysis_in_meta_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/76977422016.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/potesul.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/tapofobeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/wekolaxotasulivowegevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0793/files/vemalak.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/89276284731.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/
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f90.bin
ced8c003992503901df9cbd4ae2a8dad7260cf2274a18e31af253ca52bdc58d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F90 5628 bytes
font_01_sfnt_off00009297.bin
a0a00351f759bafdd197085c96c95e3f854f665c0b06222def2d1a581e760490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9297 10088 bytes

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