Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4277b170e56931d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-07 17:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a0cdb82c9f916cc5e78907d4b79a05 SHA-1: 8d4b2343513588a8b447e75222682afd2f16d029 SHA-256: f4277b170e56931d066a73a8a9f98172f10a0c6db5cf3f86e8f647c055c4ac7e
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One critical heuristic identified a link to a known malicious redirector, 'ttraff.com', which is likely used to obscure the final destination. Another critical heuristic indicates this is a link farm, with many links pointing to PDFs hosted on 'cdn.shopify.com', suggesting an attempt to game search engines or distribute malware through seemingly benign documents. The document body itself contains garbled text and references to 'glencoe chemistry online textbook pdf', likely a lure.

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.com/pify?keyword=glencoe+chemistry+online+textbook+pdf
    • http://files.snomadracing.com/uploads/1/3/1/4/131452733/4928112.pdf
    • http://files.acadianacarpetbinding.com/uploads/1/3/1/0/131069899/a7b04f9dd.pdf
    • http://vezupab.omarwaraich.com/uploads/1/3/1/6/131636725/goxolagone_modog_risemeba.pdf
    • http://files.visualmediaonline.com/uploads/1/3/0/7/130776855/sujumiwulax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/34659740471.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/gatowifezataf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/89986334329.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/64968814751.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/77732170932.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/vawefofotujegereduduj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/2936968635.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/subanugusotufuxeguzimes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9996/3044/files/xibubapokivawenofef.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/gen_4_ou_team.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/zifadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/25302085602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/96531592259.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/volexesoxosiweloledixepip.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/20424815836.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_off00004890.bin
133517aec83fa191507f538cdeaecb5a7e537f2eef343bbb6ed99814b1f01b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4890 5588 bytes
font_01_sfnt_off00005b74.bin
86180fcd0fb2b2d3f0e8f1c81cec58dc1f9b8691c7f9de5995e3527d64d1e4b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B74 9376 bytes