Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8884d576dea3c5…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 22:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba654002574975bb13b2827fa5b76d3d SHA-1: 1b1e2402f6918c1e86ba53550114ebd0dee3ed98 SHA-256: 3a8884d576dea3c59edbe20278f974d12ccbaf9736bbd86370bdb0d3b01905be
150 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious URL, disguised as a driver download for an HP printer. The document body and heuristics confirm the presence of these malicious links, indicating a phishing or social engineering attempt to trick users into downloading potentially harmful files. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/wix?keyword=hp+laserjet+1320+printer+driver+free+download+for+windows+7
    • https://static.usrfiles.com/ugd/696b8a_3ab76ef2ccff432f8d15b74e6817ad1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ecdb13adb7c4b1888c2f9531758d173.pdf
    • https://static.usrfiles.com/ugd/b8c837_b56ac838de1e45c4aa4b3ce74cbf2cae.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf8204b084274036b0933a571710e5af.pdf
    • https://static.usrfiles.com/ugd/822ecd_df0613a258b143368bc8fb5ec2e86cac.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/28016710649.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/lifijoxizapebebadosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/vabumefimafodizejojimixo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/advanced_javascript_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/59797390909.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/gukenamaposadabugawevapas.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/local_anesthesia_in_dentistry_book.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_off00006e1d.bin
c43bcefbce3b19b71ad782d484a958d4707be9b1aebfe2791a36bd6aa785c405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1D 5792 bytes
font_01_sfnt_off00008203.bin
26ad236296e95dd272d0f6431232a366ecac9c801558a921b083de277920eecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8203 10716 bytes

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