Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c90831be3e6d7fb…

MALICIOUS

PDF

48.1 KB Created: 2020-07-30 02:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1865eb3050f335586df16ca042585b5 SHA-1: fdad0af6568eeb042c757e31e8dced81b65d1d51 SHA-256: 9c90831be3e6d7fb9e9dae56137866d8bfbb5c0a61f4f71095b72aefecd5a661
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is ttraff.com, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the lure.

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.com/pify?keyword=complete+boxing+training+program+pdf
    • http://files.earthtopdx.net/uploads/1/3/0/7/130740589/8084454.pdf
    • http://files.upgradedcomputers.com/uploads/1/3/0/9/130969352/kokew_jelavamidu.pdf
    • http://files.swsection.org/uploads/1/3/2/8/132814355/961000.pdf
    • http://files.kyletheinspirer.com/uploads/1/3/1/4/131406403/a1268db72.pdf
    • http://files.stfrancisresourcectr.org/uploads/1/3/0/9/130969408/c315433.pdf
    • http://files.kyle
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/borebi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9290/8963/files/87279754473.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/jajobefanojuzu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/50297080602.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/80216362930.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/80279584609.pdf
    • https://cdn.shopify.com/s/files/1/0438/0377/1041/files/puxafisumazut.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/mugomasebikebitezulus.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/31920222762.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/72083948280.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/lulisapadafevivabufokego.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/16935991389.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.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_off00007e14.bin
a0dd174f7d5ef163739102ec9d0a1d033d1ced2e0fb7d10c3d69464ccee3a2a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 5204 bytes
font_01_sfnt_off00008fb1.bin
7ca199a1219aed0fdee658506341d9094f456e73a8a8e12bbe54da8d37b0cb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB1 10316 bytes

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