Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bf28a69a885bf4…

MALICIOUS

PDF

44.0 KB Created: 2020-08-28 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ece22e5922d57527a7a62fd07b29f74f SHA-1: 64a23cf5233d72c7b9d8fbee7b7b67916566a194 SHA-256: e0bf28a69a885bf442e938a693bac8806a992241358d1a0c100d22416fc377cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains numerous embedded links, a common tactic for SEO spam and phishing lures. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=police+constable+exam+questions+and+answers+pdf`, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'police constable exam questions and answers pdf', reinforcing the lure. The presence of multiple Shopify-hosted PDF links suggests a link farm designed to improve search engine ranking for malicious content.

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=police+constable+exam+questions+and+answers+pdf
    • http://fojuruvu.themisandthread.com/uploads/1/3/1/8/131871578/98158c29b54216.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/gusilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/39461479248.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6306/files/bitanupanogugezupodiganu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13002849425.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/34949436172.pdf
    • https://cdn.shopify.com/s/files/1/0467/7641/8457/files/39258584483.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/86272567469.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/wofanuvodokepewisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6437/8022/files/57082520874.pdf
    • https://cdn.shopify.com/s/files/1/0433/7169/2188/files/aged_bell_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/fobogofaxidazamipiwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef0.bin
687889d3365ff8ada729b63e05da7ef74be9414f7b616a16efef715c03cb4e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 5612 bytes
font_01_sfnt_off000071e5.bin
41dfa07b8a13570a9aff139fb5285cae2b1d05cfce314d18a07e93ed638bb07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 10296 bytes
font_02_sfnt_off000094e9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E9 4324 bytes

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