Malicious PDF — malware analysis report

Static analysis result for SHA-256 4055e08ba602ccf6…

MALICIOUS

PDF

35.6 KB Created: 2020-08-24 19:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f986075c5f74c18e7c08ed7d0e458078 SHA-1: acd0c20bc9a722f91592baa3731c89bfa114856d SHA-256: 4055e08ba602ccf692d496de1bf26350ff09f5f38217c88c2a223fa6a5bd095f
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=net+force+particle+model+worksheet+answers'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same redirector URL, reinforcing the phishing or malware distribution intent.

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.cc/pify?keyword=net+force+particle+model+worksheet+answers
    • http://files.beach24h.com/uploads/1/3/0/7/130739081/d72df191.pdf
    • http://vusolok.michcitizenaction.org/uploads/1/3/1/3/131380828/gifegufafogiludutiwo.pdf
    • http://files.thespacebeechworth.com.au/uploads/1/3/1/4/131438483/7fef8facd07e37.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/caste_validity_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/cadenas_ganglionares.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/amar_ujala_epaper_bhadohi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/my_age_of_anxiety.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/vefivolifitefoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/jubaranewukuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/ritupegikejelisulajon.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/8934755988.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/86620991152.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/13713492265.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/dipoxujiribaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/sublime_text_4_release_date.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/44894555535.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_off00004b73.bin
90fdccd1d403009e5fcc99f83da337a8b0052649d74ee4237dc50d062ce51f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B73 5520 bytes
font_01_sfnt_off00005e28.bin
c29b7c48233ac79b857a4a2c3340b03b5d1655a4227b6289acf83bef6d627a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 10744 bytes

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