Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6114c5d58a1fc0c…

MALICIOUS

PDF

38.2 KB Created: 2020-08-25 10:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04d4d575ccd7331f42af78d82f82a29 SHA-1: 45790cbf88fff5a184e23108e66a6637833505c3 SHA-256: e6114c5d58a1fc0c00341a28b7e9ca84c728aebe955774e39e6512b2668162ae
154 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.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL. The primary intent appears to be luring the user to a malicious site via the embedded link.

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=american+cyborg+movie
    • http://buwumag.talltaledesigns.com/uploads/1/3/1/4/131437237/2477379.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/tenapuledanagebamajokeraw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8146/6005/files/dolisumomobabonavixiboza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/bigo_live_ing.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/axelos_itil_4_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/9151978285.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/how_many_days_till_spring_training_2017.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/30360928986.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/71672484674.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/65088510730.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/lekilozifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/27282114980.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_off000048ac.bin
cb2cd79160954b63321debd2f1a36c440bbf09ba1ce5b2d19d4c51f1953df243
pdf-font-stream PDF embedded font (sfnt) at offset 0x48AC 4908 bytes
font_01_sfnt_off00005934.bin
ccba16ac2f74318f95aa7a5d4fea96a66f2257466fd5611cffb5808a0a305e83
pdf-font-stream PDF embedded font (sfnt) at offset 0x5934 10852 bytes
font_02_sfnt_off00007e44.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E44 4324 bytes