Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9da47d44a4b99a…

MALICIOUS

PDF

66.0 KB Created: 2020-12-20 06:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3065e1a1356b19502f785fb8ce1e4450 SHA-1: 65e070834219b45e9379e3342359d90cd698703e SHA-256: 1f9da47d44a4b99af10e30799bc91497f70cebc04741abc69c173cfe0bf0d329
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though partially garbled, contains text suggesting a lure for 'unlock root software apk'. The presence of a link farm and a high ML score further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=unlock+root+software+apk
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/jezowogabusot_dajuxax_peloxidinivolup_foxilabeleturak.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd2ec8395d15.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5fd2333cb98ae.pdf
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5fa6658329e76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/29485220253.pdf
    • https://s3.amazonaws.com/mesotodimus/chrome_snake_game.pdf
    • https://uploads.strikinglycdn.com/files/059c1069-8e81-4de2-b4db-6ad56847acd1/zabovisokujanosa.pdf
    • https://s3.amazonaws.com/xipavir/mateliza.pdf
    • https://s3.amazonaws.com/petubapizo/gigupobije.pdf
    • https://s3.amazonaws.com/tazibabebamep/zobojakitopavefifuzimaj.pdf
    • https://s3.amazonaws.com/luramamelolem/dota_2_phantom_assassin_item_guide.pdf
    • https://uploads.strikinglycdn.com/files/1511e8c5-4e28-493a-90ff-527c3fb80f82/30812325797.pdf
    • https://uploads.strikinglycdn.com/files/68b35acc-8081-416f-8ad0-daab251483ed/59422404362.pdf
    • https://uploads.strikinglycdn.com/files/9b57c27b-6136-4bc8-b279-3f1fc9e69b11/15893630754.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_off0000c5fa.bin
a657bedef64e790d474eab28bbe470c1a1cc272ec58a59186feb255a63606aea
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 5156 bytes
font_01_sfnt_off0000d7b3.bin
addae931560169d5754f57608838c182f0ae1a2aacb0f51a7282c4a4fda4693e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10732 bytes