Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eab61c07f87ad6…

MALICIOUS

PDF

71.3 KB Created: 2020-12-02 10:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab8b025b26922231ed12162a57018d44 SHA-1: 582a0e7afaf5eda0b79544fde722134ce2ca101e SHA-256: f4eab61c07f87ad683fe7a7475fade01ba442f06447acb6264069c1a4f090ea9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDFs, indicating a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=hot+lather+machine
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/b18984.pdf
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/e19500ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06ad1491241adc46f397/1606223535121/12933384746.pdf
    • https://static1.squarespace.com/static/5fc2953ad26ff1194f7e808d/t/5fc4b2dc6457125654d058d2/1606726369783/xoxeginidox.pdf
    • https://static1.squarespace.com/static/5fc56dbc92c50b1a1e95e2fe/t/5fc71ebcbfb90028be4ab8e1/1606885052472/84095763431.pdf
    • https://static1.squarespace.com/static/5fbfe895e5c7695ca99606f9/t/5fc0dc46e18c5c478e1c0b4d/1606474824111/bufubogutixiwo.pdf
    • https://s3.amazonaws.com/lezopobigeza/wiwexi.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd16d9eedf07488261c7d5/1606227675541/4_regions_of_texas_with_cities.pdf
    • https://static1.squarespace.com/static/5fc0f7fbe9fc3622d5227cd2/t/5fc1d52df81c9a2a0ce52854/1606538544125/25409669209.pdf
    • https://static1.squarespace.com/static/5fc17f7ea13a450babf85411/t/5fc62aaf4e98326c02e3c565/1606822576673/free_background_remover_app_ios.pdf
    • https://static1.squarespace.com/static/5fc1a18fea4a794d564a4325/t/5fc3df6e4e98326c0288385f/1606672238697/the_fisherman_and_the_jinni_story_summary.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_off0000d9b7.bin
db68ce298a1af4928b2102ae3828e40cd133c4d8a8ed2ebec1e318a4ffe662b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 4824 bytes
font_01_sfnt_off0000e9ec.bin
08c051dfc89442d4131512839b42fdb5e31aed7ef603b492d5d61e35fd7f3b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10960 bytes