Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31cbd7f7091c9b…

MALICIOUS

PDF

37.4 KB Created: 2020-08-20 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83913407f0fb29dd17e6739dc44b1161 SHA-1: 2e3bb7c16a9d39b0a6ee5e7febfa2f268df3a346 SHA-256: ef31cbd7f7091c9be1d15cd358bb71cccc74614661dca0562209033742a90886
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are designed to lead to external websites. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.com), indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to 'Antepartum haemorrhage management guidelines' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The presence of numerous PDF links, many hosted on cdn.shopify.com, points towards a link farm or SEO poisoning tactic to distribute malicious content.

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=antepartum+haemorrhage+management+guidelines
    • http://koxuf.oregonoutbackadventures.com/uploads/1/3/0/7/130739916/kejesobuzobajiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1900/files/happy_mass_birthday_song_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/wunelediridokugatomufebop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/how_to_get_photoshop_for_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/8292507150.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/honeywell_space_heater.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/wimixetit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/ripakajopi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/manualidades_faciles_y_bonitas_para_regalar.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/dawexilibubogagis.pdf
    • https://cdn.shopify.com/s/files/1/0435/9405/5843/files/d_d_5e_monster_manual_free.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_off0000543d.bin
0ecb086e14dc1c2928136b9e1902759441aa44c0ba58d9b6e573015c4064057a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 5360 bytes
font_01_sfnt_off00006645.bin
4519ec28fc7d01abdecbdb59c42fc4123659ec2e9a23ff435689dbc00de94821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 10188 bytes

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