Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc8d7ab761e8d7e…

MALICIOUS

PDF

35.9 KB Created: 2020-08-24 18:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbd960dca1bb5ee9892fd4431055d461 SHA-1: 36759a806d1caf83cf02da0b4bd1cd2dd73919f2 SHA-256: 1fc8d7ab761e8d7ea0302e037a1873b44fa2359da2d093a1144f46353ed363cd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to host malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=maths+sheets+for+grade+1+australia', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 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=maths+sheets+for+grade+1+australia
    • http://xenonusi.joshuapcole.com/uploads/1/3/0/9/130969573/a44a568458cd61.pdf
    • http://files.asianlifestyletv.com/uploads/1/3/1/0/131070895/4527842.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/72221551893.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/74249796743.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/kentucky_aphasia_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/bloons_td_6_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/tony_montana_bala_bala_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/gafimiruperelalowilovul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/7257073294.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/68313711712.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7397/files/asian_countries_and_capitals_and_currencies.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_off0000504a.bin
22ff3793506f24eee57ff10f2c48e686994b853655779479f3c639b0bfb007c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x504A 5224 bytes
font_01_sfnt_off00006212.bin
d26d9f7d706c682eb32e892a75e024aec0f3ded34cef0cd27ea874244809ad45
pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 9712 bytes