Malicious PDF — malware analysis report

Static analysis result for SHA-256 876e9859755834b6…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0e5c0165fd7583261872fac35c7c8d1 SHA-1: cd8afa7b3faa549997081f8d588c3a85914cf236 SHA-256: 876e9859755834b6168a8e125233c4f15b3b59dc675640422a1bfa06c2d13ca0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known to host malicious content. The document body itself is heavily obfuscated but appears to contain the redirector URL. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=just+speak+up+book+pdf
    • http://files.goflysoon.com/uploads/1/3/0/7/130739922/meronekobatum.pdf
    • http://files.jessicadeleon.com/uploads/1/3/0/7/130776536/jepobato.pdf
    • http://files.innerpathways.ca/uploads/1/3/0/8/130873902/pukilezaboz.pdf
    • http://files.clemsonorchestra.org/uploads/1/3/0/8/130874162/6148064.pdf
    • http://durisub.trouphighchorus.com/uploads/1/3/0/8/130814423/kafumevupobitixujuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/35368761768.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/cambridge_primary_mathematics_learner_s_book_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/xikomeposavitip.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/baverolupobabagi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/applied_physics_book.pdf
    • https://cdn.shopify.com/s/files/1/0451/4132/8026/files/78903689166.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/66980641364.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/chacha_chaudhary.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/jorozinegadoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/59873953930.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/84599725572.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/complete_callanetics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/kutajumefareponuda.pdf
    • https://cdn.shopify.com/s/files/1/0438/1261/8400/files/zewadududubukozos.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_off00006e96.bin
eaf2a126a9c38cac618544d5520bc182a022cdfe4a2b5f2b203d97c0f9b77dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 5100 bytes
font_01_sfnt_off00008006.bin
0382b450a22b1b509db252a1c442f16f28f8ffee783186d4c7a63abbb28caf7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8006 10344 bytes

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