Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4732b20dfc8dc5…

MALICIOUS

PDF

73.9 KB Created: 2020-08-09 23:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a940b744cb440e439a033dca672266b1 SHA-1: 58e2f9dfbb282392908f9cb904a5c2a0ddec1489 SHA-256: ec4732b20dfc8dc58743d63c832ac5a64b927798cd5e0569d5eed738c122ee25
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This link, 'https://ttraff.ru/pify?keyword=alibaba+aur+40+chor+story+pdf', is designed to lead users to potentially harmful content. The PDF also exhibits characteristics of a link farm, with numerous external links, as flagged by PDF_SEO_LINK_FARM. The ML classifier strongly supports the malicious nature of this document.

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/pify?keyword=alibaba+aur+40+chor+story+pdf
    • http://files.danielepiserchia.com/uploads/1/3/1/6/131607407/pafukujuzebix.pdf
    • http://files.kind-mind.org/uploads/1/3/2/8/132816096/diwevuf_liniv_rebuxamixakep_pudubekibikarog.pdf
    • http://files.wamindaworkingstockdogs.net/uploads/1/3/2/6/132695575/xabudadizularazi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/marvel_universe_comics.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/kaiji_ultimate_survivor_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/84747649888.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/71705615973.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/80231117278.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/45051227706.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/english_grammar_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/new_functional_training_for_sports_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6003/files/le_moringa_et_ses_vertus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/rubidenamaparupisajix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/54506583016.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/problems_of_budgeting_in_nigeria.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a670.bin
5635ff5be5e5480d75e9b0c28f759df1a7d5850f9a3de3ef3dc0336c74c0b25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA670 4504 bytes
font_01_sfnt_off0000b646.bin
738513808fa0bf7bf632a21ffd5f0eeca79c1ede8b821abf1969a64067338e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 5704 bytes
font_02_sfnt_off0000c9b1.bin
3f637fd57eb77bd8d7e6fddabac4981ca7c10246717db15613f34ddfdea0cc29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 5252 bytes
font_03_sfnt_off0000da22.bin
14816233e06d784207ab54e2a18f9686cdf6d2ed46050d95fbbcf650b3d463eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 10376 bytes
font_04_sfnt_off0000fdf7.bin
32e3acb650de156f5c4b6d16f007b06118e81c97d93810d3715f3c86025e1e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 17724 bytes

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