Malicious PDF — malware analysis report

Static analysis result for SHA-256 80093922370d51bc…

MALICIOUS

PDF

43.7 KB Created: 2020-08-03 06:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed522dbf5f7fba368fa139421c335fe6 SHA-1: bda4527804af7878e4f7a1e8a4f88f61b037a56d SHA-256: 80093922370d51bc33263b3e8fdb22a5fec6bab9df9105f38987c69b095c184b
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=tubing+bender+harbor+freight'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the redirector URL and a keyword related to a product, suggesting a lure to a phishing or scam page.

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=tubing+bender+harbor+freight
    • http://files.mattiacupelli.com/uploads/1/3/2/6/132682802/dokubukenud-wunoxolurujo-tazatomozakum.pdf
    • http://files.kendrakoivu.com/uploads/1/3/0/8/130874113/jejup_vumido_bajigerabijuro_fopajuvixugali.pdf
    • http://files.myfureverfrenchie.com/uploads/1/3/1/1/131164063/a0b19a8531e5.pdf
    • http://files.danaechohawk.com/uploads/1/3/1/0/131070827/b565e4438b90.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/63542711030.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/13726633610.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/vajekemugadugepirira.pdf
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/rawaxomipirabunobezawiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/51084286720.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/60343440238.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/dmv_ca_written_test_2016.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/49841107445.pdf
    • https://cdn.shopify.com/s/files/1/0435/4156/1503/files/45580591089.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6293/files/chrome_extension_storage.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/saxugubajigerefuwojolewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/12594671762.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_off00006c58.bin
4045106c12049c6098ef7424b393dc68bebed630a4f4967adc25b9f7ef548e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 5048 bytes
font_01_sfnt_off00007d82.bin
48bb35c3398e76534ec0e419e04123317c6cf6bede62c418ff9396a8f655af78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D82 10676 bytes

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