Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdc471d2c45cc7d…

MALICIOUS

PDF

111.5 KB Created: 2020-08-12 18:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db0545f9aa7bd19a8de10c830930d15 SHA-1: ba2fbaab997fc115260cd5b5833a1e6d3f712086 SHA-256: 8fdc471d2c45cc7d0ee45d558cb28f7eccef3128aa245c177b1ccd211aa6ba37
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=ansys+help+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure for users to click through to a potentially harmful site.

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/pify?keyword=ansys+help+pdf
    • http://files.responseplumber.ca/uploads/1/3/2/8/132814427/b2e8fa28f84d.pdf
    • http://files.pinsoncosmetics.com/uploads/1/3/0/7/130740464/3773110.pdf
    • http://zanunali.lofgrenmusicstudio.com/uploads/1/3/0/8/130814411/2d8fa4a41d17.pdf
    • http://files.thesolomon.co.za/uploads/1/3/1/4/131406222/vupevazeponu.pdf
    • http://files.breadandbuttertogo.com/uploads/1/3/1/8/131871439/2518929.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5745/files/salow.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/toyota_4runner_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/1988_chevy_truck.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/bivupetalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/python_string_to_list_of_chars.pdf
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/25120922524.pdf
    • https://cdn.shopify.com/s/files/1/0443/8907/3062/files/amar_ujala_newspaper_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/bixomelebavojabopekudip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/dinove.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/rigefofakatas.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_off00017dd2.bin
fe81bea06cd35bb2eaf3f6634ac22a24a79c355f4c3175a2ccb0481506825e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DD2 4912 bytes
font_01_sfnt_off00018e8f.bin
a43d5d88e6ec6677c3810eb982d915e543f0e8305f2ac071efb821f60a768baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8F 9972 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.