Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7bc4b572391e7…

MALICIOUS

PDF

48.2 KB Created: 2020-08-23 01:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0df978ed1ee66c0c5639690f44ab8c SHA-1: 76dc16e573c5da731a99eba2d7fc3e3f3260a906 SHA-256: f9f7bc4b572391e7264dca17144a89da69b5a4259816b4dd40da14e7ac043001
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=ringing+bells+app'. Additionally, it exhibits a PDF link farm behavior, with numerous embedded links to external PDF files, many hosted on Shopify. This suggests a tactic to either distribute malicious content or manipulate search engine results. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=ringing+bells+app
    • http://files.thelifeofmrstucker.com/uploads/1/3/1/4/131438604/bumurejudanemenaveb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/5004216126.pdf
    • https://cdn.shopify.com/s/files/1/0435/2753/6799/files/4350709926.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/caller_id_theme.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/calculus_early_transcendentals_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/wunosokoditakot.pdf
    • https://cdn.shopify.com/s/files/1/0458/5658/7929/files/guia_autometrica_mayo_2019.pdf
    • https://cdn.shopify.com/s/files/1/0436/0483/6515/files/agar._io_free_online_no.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/jaxogogopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/46912435621.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1846/files/79722440402.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/acca_p4_summary_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/momipatanoniw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/st-_10_form.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ab.bin
7b000e83f460db6dcab32cdf2cf04d9cf5cb527b3c7e7d4edfd5e7a45b4735b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 5040 bytes
font_01_sfnt_off000072db.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 1800 bytes
font_02_sfnt_off00007b68.bin
9c60645a3acafddf04beb5753235d9b3bebdfdc82c96e742922656886ab6f362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B68 10068 bytes
font_03_sfnt_off00009e11.bin
069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E11 16376 bytes

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