Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1e611cfb8647fc…

MALICIOUS

PDF

45.7 KB Created: 2020-08-20 04:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8027dad02e69165f27154ab6cc2dd2 SHA-1: 61ecfe97ef8b2d6b0eed0aca43b4d1794e182298 SHA-256: 7e1e611cfb8647fcc8ac8ac8c676947edbf4ffb4d56361bd4f624ebf819df4d9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. The PDF also contains a mass external PDF link farm, with many links hosted on Shopify, but the primary malicious indicator is the ttraff.com redirector. The ML classifier strongly supports the malicious verdict.

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=fur+elise+flute+sheet+music+easy
    • http://files.markchrisler.com/uploads/1/3/1/6/131637054/jugigupazojadope.pdf
    • http://kafaxi.thefellowshipsite.org/uploads/1/3/0/7/130775219/pesog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/58931030336.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/20372590412.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/valoromujedid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/6243094711.pdf
    • https://cdn.shopify.com/s/files/1/0446/9224/2588/files/63792658823.pdf
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/jebapamurinodepimuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6226/files/candy_terry_southern_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/foods_to_avoid_for_kidney_stones.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/analysis_and_design_of_algorithms_arora.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/logic_gates_and_truth_tables_questions_and_answers.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_off00006ab5.bin
fb9005ee2d17c72284ca072056707dc34a8fa4c658db5133fc48dfa35ed2af2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB5 5176 bytes
font_01_sfnt_off00007c33.bin
e9b879ae843fa4250ee3e5cbe5bb46cb79f01e9fe5d8dfeb7970388cfd32d416
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C33 14832 bytes