Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c094e659609524…

MALICIOUS

PDF

46.5 KB Created: 2020-08-06 20:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b92602717d1f92ed85e2e60fda80bd0 SHA-1: 7e0bde3bd70c05aea647326a5e326ae4a8893267 SHA-256: 21c094e6596095243ffeb5bc548d83d180e2b75e5d4c6765d867efc28ffbedcb
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a large link farm. The document body contains text related to 'back exercises with dumbbells pdf' and includes numerous URLs, many of which are hosted on Shopify and point to other PDFs. One prominent URL, 'https://ttraff.cc/pify?keyword=back+exercises+with+dumbbells+pdf', is identified as a malicious redirector. This suggests the PDF is likely part of an SEO poisoning or phishing campaign designed to lure users to malicious sites.

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=back+exercises+with+dumbbells+pdf
    • http://files.chefjasonhoward.com/uploads/1/3/0/8/130814588/3ea6dc776.pdf
    • http://files.parentfirstcouncil.com/uploads/1/3/1/3/131382387/40b3a846c7d954.pdf
    • http://files.littleheartrocks.com/uploads/1/3/0/8/130814124/111038.pdf
    • http://files.embroideryequipment.com.au/uploads/1/3/1/4/131437689/tagopidenesos.pdf
    • http://files.kylierothfield.com/uploads/1/3/1/4/131409574/7282080.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/pokemon_go_ipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6933/files/57354986355.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/autocad_3d_home_design_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/18728498496.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/38448241791.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/6683047662.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/inertial_bounce_after_effects.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/wusavugelezoniwovobadame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/cours_chimie_atomistique_l1.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/barreras_psicologicas_de_la_comunicacion.pdf
    • https://cdn.shopify.com/s/files/1/0428/8793/8211/files/zubatatas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000698f.bin
28052326bec71ff992c5a2c5ad1f405593b5be89684b52c464f74cc3443a4e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 5472 bytes
font_01_sfnt_off00007c3c.bin
99fe07fcdf4b98ca36e0944aadca3d4c5d1b9856ebe7e2a1ea8ce4fa93d864c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3C 10092 bytes
font_02_sfnt_off00009ef4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF4 4324 bytes

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