Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e77537637bec9…

MALICIOUS

PDF

51.3 KB Created: 2020-08-01 04:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85408b92bf80753b72dea11524e12f3 SHA-1: 59b341c8545e9098dd568543bb4b1a8219a4483c SHA-256: 759e77537637bec9b2a12a734056efef9bde3d38996b2d2d66c617a5d5b9b1d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to a link farm infrastructure designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL identified is ttraff.cc, which is known to host redirectors. The document body, though heavily obfuscated, contains references to the topic 'does google docs save automatically' and includes the malicious URL, suggesting a phishing or scam 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.cc/pify?keyword=does+google+docs+save+automatically
    • http://files.zweiteconsulting.com/uploads/1/3/1/6/131606261/direl.pdf
    • http://files.whittsendranch.com/uploads/1/3/1/4/131453194/4884255.pdf
    • http://files.peacenaperville.com/uploads/1/3/1/8/131856392/sevixuvasotox_nefuwi_febapanek.pdf
    • http://files.idahowildrosefarms.com/uploads/1/3/2/6/132680827/dexonuxoda_xiziposamobejo_fixezamufo.pdf
    • http://files.morrisflipsenglish.com/uploads/1/3/1/4/131407138/bokuratigowobugoxozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/81792355942.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/vigorusipotikibafurekutu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/boost_log_in.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/xefovofazek.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/votupenebofasu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/vasudupusixozitap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/83433990727.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/xoragupulage.pdf
    • https://cdn.shopify.com/s/files/1/0435/2249/0532/files/how_to_uninstall_nvidia_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/18408649929.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/siwibubuwam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/fonapovokogopafaxekadub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/kawaxurizelevop.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_off00008b24.bin
ab3d93b5ea90c7487ea7edd25c223562d5e77e3913238def99b67386a6fdbd4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 5324 bytes
font_01_sfnt_off00009d48.bin
9678f2b1ccd542ab1cdb8a5247884a72205ce223799de5da5750ae8c203eefce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D48 10240 bytes

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