Malicious PDF — malware analysis report

Static analysis result for SHA-256 719e63369e116a3a…

MALICIOUS

PDF

41.9 KB Created: 2020-07-31 23:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3574de679a613f68cc7b146c2e2a49b SHA-1: d05608e957cc59c1f07de8f8dd4a794186a2f9a7 SHA-256: 719e63369e116a3a5148d091adb87735496e6ca1ffe73332cbe5162f12f9488f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.cc, a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious 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=engage+coolant+chamber+network
    • http://files.neuralmechanisms.org/uploads/1/3/1/3/131381605/xaxesik.pdf
    • http://files.apaacupuncture.com/uploads/1/3/2/7/132710497/munifako-gunopoxuwemopu-zalelibida-wediluvisa.pdf
    • http://files.jessiebrownphotography.com/uploads/1/3/1/1/131164236/9e471e16d0f72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/rudes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/77648669896.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/6707424968.pdf
    • https://cdn.shopify.com/s/files/1/0432/0015/1707/files/9668435542.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/guripo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kurejala.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/76199261770.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0951/files/sinogewirosutixazixok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/64389718169.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/jakimonel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/dezewefotowifivetelame.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/lijenukokuburaxikage.pdf
    • https://cdn.shopify.com/s/files/1/0430/1173/5705/files/73929283639.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648c.bin
93667d6744cb1c7b8ee8935f61073967b4370a8bba5022ada5d3058032f916e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 5288 bytes
font_01_sfnt_off00007674.bin
2315573b1ebce1470bf3c1f41f2938997e3b6c3994295ae1873d81d2d45a30d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7674 10992 bytes

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