Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af9a808f514bd8…

MALICIOUS

PDF

35.4 KB Created: 2020-08-10 14:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a74add571b803697cf0297e263a09cfe SHA-1: bcc65dc3a82e648f42b10aea81ec6252383e6ffc SHA-256: 66af9a808f514bd8844f50f818770f571251bb7d9c4d3af6b04ad1c89b5b3ec5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to other PDF files hosted on external websites, creating a link farm. One of the primary links directs to a known malicious redirector, indicating a potential phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

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=functional+analysis+balmohan+limaye+pdf+free+download
    • http://files.christianlisker.com/uploads/1/3/1/4/131453870/5be2971.pdf
    • http://nitivuwa.addressphonelist.com/uploads/1/3/1/8/131856907/251f921.pdf
    • http://files.mckennahomes.com/uploads/1/3/0/8/130874474/9141602.pdf
    • http://files.keenbeancoffee.com/uploads/1/3/1/3/131381046/91da89d19.pdf
    • http://files.spectraltech.org/uploads/1/3/1/4/131437711/vukipovosokeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/vejelinuzolesixux.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/tadabazelale.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7333/files/69024695405.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/55793005302.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/nakufufodirosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/89609430639.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/wasuxopejotizobi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/83313225568.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/95086126499.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/spoken_english_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0436/5841/2185/files/php_generate_from_html.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aca.bin
4faa24054662713746460d9442ad00a7395910e945fe53f3c0000220c0e547cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ACA 5684 bytes
font_01_sfnt_off00005e05.bin
5f6fd50f0a9046bb34b82306a79d7c622be3d9a6d5e7cccc3e0735d6080a4ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 10096 bytes