Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dbe92b715cfd43…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 16:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa33973efed3340cb8f229d039bf4301 SHA-1: 2bad000271cac9df76f92fd82d4e4671a7cff3cd SHA-256: b1dbe92b715cfd433c584ccc9ab2a8feb2e7fa5f1d6340a1929c8d86d28e4048
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent URL, 'https://ttraff.ru/wix?keyword=industrial+sewing+machine+repair+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking it. The presence of multiple PDF links, many pointing to Shopify, indicates a link farm strategy to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=industrial+sewing+machine+repair+manual
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/ethnography_of_communication.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/baccho_ko_khelne_wale_game.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/pigavete.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/platonism_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/penguin_readers_level_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/jojewetosedi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/81011347637.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/fejivibufirabunexovukubet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/nafulapopaluto.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_1bf7fe85f7714d99a117b65f589df9a0.pdf
    • https://static.usrfiles.com/ugd/bae363_4c0dff2bd1b34a57b5429da1f253dfcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1920bac43bc4cbc9166c3adc1abea13.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/multiplicacion_de_polinomios_ejercic.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4149/files/nobupas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/valuation_of_assets_in_accounting.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_off00006bc0.bin
314a003a491922fa26b33a676db62051cf73f99dcb11d8e53533a89c57de107e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 5288 bytes
font_01_sfnt_off00007d93.bin
af29ce63074656cdb5999c87909485832eb9668a68967c9c53596f6b0010edad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D93 10632 bytes
font_02_sfnt_off0000a177.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA177 4324 bytes