Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9eb8c868552de8…

MALICIOUS

PDF

36.1 KB Created: 2020-08-04 16:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0a11379801f8f9f209f46525587c7e SHA-1: a972a6b16c0fc07912422e5049c0cb30b07c41dd SHA-256: df9eb8c868552de85ccefd39cd1620bdf6e7e3c622de1d601c7303f3aeab6e67
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free sheet music, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing numerous external links. No scripts were extracted from this sample.

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=amazing+grace+my+chains+are+gone+free+sheet+music+pdf
    • http://files.achieversmindset.org/uploads/1/3/1/3/131381078/funuzexomigolaxag.pdf
    • http://files.tigerterrain.com/uploads/1/3/1/4/131407042/vujup-fexakanapoba-sogefori-komulu.pdf
    • http://files.etiennemedard.com/uploads/1/3/1/3/131380063/vaxiwoni-zigen.pdf
    • http://files.ellistallman.net/uploads/1/3/1/4/131436956/45f41fdaa6de.pdf
    • http://files.michaelaadelineart.com/uploads/1/3/1/3/131383943/nixejekusilisoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/juxofam.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/fusunuro.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/xofovasutum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/feloxajurudegixilejaparim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/79297162060.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/suzigobovonamobegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/roblox_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/2735906124.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/92170529342.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/vunimazokusonutegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/javascript_tutorial_point_full.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_off00004d69.bin
376d66d087708187615c2e4575fe22df42fa3c332853433a62566164068c8070
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D69 5680 bytes
font_01_sfnt_off000060a9.bin
f940e991ec85693a2da7378ce2a4a587c48dcfc5b1cb25171c222b47a9342e87
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A9 10256 bytes