Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49da560313e46c4…

MALICIOUS

PDF

73.3 KB Created: 2020-08-06 11:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0d242ea307b1a82ee5f40438b3cece SHA-1: 87e11368bd7769be4251870d55203ca792a2b1ad SHA-256: d49da560313e46c42248d2ff557705ce99090c940f0131b5d10700929b91efed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=credit+risk+control+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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.cc/pify?keyword=credit+risk+control+pdf
    • http://files.gregstensonwriter.com/uploads/1/3/1/3/131383953/fomoka.pdf
    • http://files.soultosoulshop.com/uploads/1/3/2/6/132683137/01baaafb.pdf
    • http://files.familyandpharaoh.com/uploads/1/3/1/3/131398231/bunolizuxedofig-lirowula.pdf
    • https://cdn.shopify.com/s/files/1/0428/7882/8700/files/2008_jeep_liberty_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/capitalism_and_slavery_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/pewezevabovivoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/ropukosuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8724/1119/files/revabem.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/arabic_alphabet_letters.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/sutenepipigatatoxofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/94764603806.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/degulivesawateg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/77579206304.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/verduras_en_ingles.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_off0000e344.bin
49c014af8aa5cbb4f124c1843840e7cd5523a94e9389313048c8770af6053646
pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 4908 bytes
font_01_sfnt_off0000f40b.bin
fbbdf48a6078037e53f8a0ba56615595317c719cd1ab0af88b0ef6bd223ec997
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10648 bytes