Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9bbbf7b4c0af75…

MALICIOUS

PDF

66.2 KB Created: 2020-08-15 04:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cebdd32e339c87af279e3f08191d7ab8 SHA-1: 29fed00d9567a7a62ae09d6147b3633c1fb69dee SHA-256: 8e9bbbf7b4c0af75e9ae8df4096b5f7353091a59a80baf55410fd208a29c7697
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to an "Algebra 1 benchmark test" to entice clicks. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic.

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=algebra+1+benchmark+test+4+answers
    • http://liful.yoansewingstudio.com/uploads/1/3/0/7/130739967/205e38.pdf
    • http://mowip.formukcontractor.co.uk/uploads/1/3/0/8/130874679/1741213.pdf
    • http://files.constantlyintouch.com/uploads/1/3/2/6/132682076/rinob_muxebifapafoxal.pdf
    • http://files.shaunandken.com/uploads/1/3/0/7/130740049/jasog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9215/5293/files/xakanolaxulotas.pdf
    • https://cdn.shopify.com/s/files/1/0447/8844/9437/files/innisfree_mask_sheet_manfaat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/ponajaxuzifavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/44563072439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0434/0436/1895/files/jatosuzivojiriwezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/44022908722.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/xomabuzedufi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/agricola_family_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/62298414385.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa63.bin
d49f352a89d015d2b1d587c6167ab9eeaad49ed1832338bfa62728403dab3e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA63 2000 bytes
font_01_sfnt_off0000b3d0.bin
6949d3daf650c20b8a1151be20be7d224044ec02265c885eb76875ffa7d1e27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 5268 bytes
font_02_sfnt_off0000c595.bin
2fb5e25530db6e969f4c5c15e07dfd8d2a0c2f9f5e22bb13cc345654b626d50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 11964 bytes
font_03_sfnt_off0000ed46.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 4324 bytes

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