Malicious PDF — malware analysis report

Static analysis result for SHA-256 87693fb1587606c0…

MALICIOUS

PDF

37.4 KB Created: 2020-08-12 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d9e9aeb089e62ae1493e2adca29659a SHA-1: d15300a91e3e2f13f48814fe74c8ca3172735270 SHA-256: 87693fb1587606c0e1fda5ef91086b37e84a7055a7c76420a31746cfa46d8eb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, reinforcing the phishing lure.

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.ru/pify?keyword=badminton+score+sheet+pdf
    • http://files.gozamurai.com/uploads/1/3/1/4/131406510/8e833cb129.pdf
    • http://files.benfranklintech.net/uploads/1/3/2/8/132815359/gemobugasuzo-xuduketasap-mewixaju.pdf
    • http://jijumogu.sandrabekvalac.com/uploads/1/3/1/6/131606069/pejavatumuve.pdf
    • http://files.amybrycewatercolors.com/uploads/1/3/1/4/131437370/jolis-romibofoxil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/wikujuwaxewuviravotusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2033/files/81383554187.pdf
    • https://cdn.shopify.com/s/files/1/0435/8642/0893/files/secondary_growth_in_monocot_stem.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/anime_girl_gets_hit_by_truck.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/xatejetimaleruxuwupurijat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/juvunoridubevefatolivip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/tekafitego.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/zhuyin_chart.pdf
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/zumazeto.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_off000055c5.bin
41a56199facafd32879fe5053e769004770995a6d55ac011d0f054c2f8b234ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C5 5412 bytes
font_01_sfnt_off000067fb.bin
231b194cd6a4f3f79fb10e1a422b9f3729d105c5d1dcec4439be2bcd83bcf17b
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 9640 bytes