Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd95c413f973f5f0…

MALICIOUS

PDF

35.6 KB Created: 2020-08-31 13:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed60f1b040e083a209af1861e81c20e1 SHA-1: d7b56fed7773fc924883b4429918501368a4b4cc SHA-256: bd95c413f973f5f0751af084147c44761cacc6a1a989f907a91dea05bae64039
154 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 critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The document body contains embedded URLs, including the malicious redirector and numerous benign-looking Shopify links, likely part of the link farm.

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.cc/wix?keyword=fiebre+anhelada+pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/overhead_door_model_2026.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/40738483749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/nutrition_assessment_tools.pdf
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/tikebowu.pdf
    • https://static.usrfiles.com/ugd/a2d007_c4e1fe555785445f9aa31115aad98059.pdf
    • https://static.usrfiles.com/ugd/a48928_0d4aa7d8dc3b4c9bb61897239e45927f.pdf
    • https://static.usrfiles.com/ugd/760101_b534c7ad57014b1095681dddbc653615.pdf
    • https://static.usrfiles.com/ugd/a4d998_95fb8e4d5cb240ed896baf5f9ab09f79.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/twitter_json_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/jejuzedumoxiwude.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/sevit.pdf
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/breath_control_exercises_for_singers.pdf
    • https://static.usrfiles.com/ugd/b8c837_fec1fbf942ba4a808d1d1c814c909eef.pdf
    • https://static.usrfiles.com/ugd/764aaa_2f9299f96c5f4095b5acd01378d3676e.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_off00004c23.bin
0f166d375b7fb5d567508501a6e5b884b40039143761ca4f3acbc5366176e272
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C23 5048 bytes
font_01_sfnt_off00005d44.bin
b05aff2caad2b172229439274b16804063f937c34e34038463809045a0f8d1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 10896 bytes