Malicious PDF — malware analysis report

Static analysis result for SHA-256 378f8970073196bb…

MALICIOUS

PDF

44.3 KB Created: 2020-09-02 01:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5893408bf4341fca4920cb627c5a218 SHA-1: 2e794050a3fa06a84ecaa32e90059c6fc0570a02 SHA-256: 378f8970073196bb47d04663afdb251061384ea5695023ecf263cf59a9f2a998
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a high likelihood of malicious intent, aiming to lure users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the suspicious URL, suggesting a content-based 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.ru/pify?keyword=best+value+android+tv+box+uk
    • https://static.usrfiles.com/ugd/36f25b_42d5a3233dac4d6cb732476b7a0164f2.pdf
    • https://static.usrfiles.com/ugd/cafc24_274b520386a34f4299ce0d3195d06236.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3a5991bec5e4334a69d2fa0767e093f.pdf
    • https://static.usrfiles.com/ugd/81ef4b_d069c9d9c0bc46d6be45f6d6382629b5.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/learn_french_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/44307205872.pdf
    • https://cdn.shopify.com/s/files/1/0447/8792/5143/files/lapixudetuwofuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/zedubipo.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1945de8c2834e48916708e4aeb9e4e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4740f20970504d9b81229f47c995bf87.pdf
    • https://static.usrfiles.com/ugd/a4e402_824cd669280d4f2299044f5071cfab4d.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_40333cf8c4174aa486c714e242a2d032.pdf
    • https://cdn.shopify.com/s/files/1/0464/6322/1912/files/bt_home_hub_3_manual_firmware_update.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/68924236263.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2199/files/awg_size_chart.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_off00006f14.bin
b5e088b556994bc90a0981dedb024168995229a3dc16f72ce18453c920ae45b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F14 5200 bytes
font_01_sfnt_off000080d6.bin
5200d350d0f7ee3526bbf09679626464c7b70f25a5a35cd79a7db4e18ed5579b
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D6 10412 bytes