Malicious PDF — malware analysis report

Static analysis result for SHA-256 629993f25d86dc85…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 21:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73762cfcd2effaa66b083f462fd882e SHA-1: a31f4f3cd7c0d3fd42858362cd69841cbd2a3274 SHA-256: 629993f25d86dc8595ea72d29dd9f44a247e44d8ace04a6eef8e21a98358115d
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO link farms and phishing campaigns. One prominent link, disguised as an 'Android device settings app' update, directs to a malicious redirector at 'https://ttraff.com/pify?keyword=android+device+settings+app'. The ML classifier and critical heuristic firings strongly indicate malicious intent, likely to redirect users to a malicious site or download further malware.

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.com/pify?keyword=android+device+settings+app
    • http://jomojul.dammannfarms.com/uploads/1/3/1/6/131606345/baresunitozapajutaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/hydrolysis_constant_of_aniline_hydrochloride.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/samipamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/20563515591.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/cerita_pendek_anak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/nopejinugelufovubitix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/burlesque_performance_funny.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/struktur_batuan_metamorf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/3772270017.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/lasudu.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_off000067c7.bin
60794d4e29904caab2a7b56314b4f92e7043f75eec3c57461b8888908a6eacda
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C7 5260 bytes
font_01_sfnt_off000079b3.bin
922a6094dc07500a39b7e2d2e40bcbfb48a58291d1787d8f04400992bdfd6f82
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B3 9772 bytes