Malicious PDF — malware analysis report

Static analysis result for SHA-256 5088b876331b4fb7…

MALICIOUS

PDF

52.4 KB Created: 2020-08-25 18:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e14153ecfae22663d163ac5f314730 SHA-1: e2d1b7cf37713a6ce04409d3b3b090d948c0eed4 SHA-256: 5088b876331b4fb7099bcb8c14cfde84cc1cb868307b1898122bd0192f359acb
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing a malicious redirector link, specifically pointing to 'ttraff.ru'. Additionally, another critical heuristic identified it as a PDF link farm, with numerous external links, many hosted on shopify.com. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, reinforcing the link farm and redirection attack pattern.

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=the+merck+index+an+encyclopedia+of+c
    • http://lukesav.alexandrawrightcoach.com/uploads/1/3/1/4/131453109/vomazanibifitolod.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/nedetebada.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1511/files/zofilotenaxunudapidiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/yale_acceptance_letter.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/kawatafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/castrol_10w40_gtx.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/zutoxiwixogazupakorabuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/gebepuwimizadomemudafuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/65090891158.pdf
    • https://cdn.shopify.com/s/files/1/0429/5999/5033/files/pdf_to_word_converter_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/5164017233.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_off00006522.bin
e6e7d57631d79281220dd1b053ac788a011540d2f98d90fc3bff2209be879a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 12456 bytes
font_01_sfnt_off00008bd4.bin
062bd90f9a2fc6de8723ae0bd5b8551bb214889b87daf1c2889885fcc5a4a4dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD4 5400 bytes
font_02_sfnt_off00009e0e.bin
85ed3516960107e53ba0ac4448f52f3e8d846afa6449f046c0baa61219e8f30b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0E 10768 bytes