Malicious PDF — malware analysis report

Static analysis result for SHA-256 8524b88d300e23a3…

MALICIOUS

PDF

64.0 KB Created: 2020-08-08 12:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39ea50b4e353dc79e6ca95d6bb51c51 SHA-1: e8df8132d981df5f77804a18f5d2ae2124c51384 SHA-256: 8524b88d300e23a3c01dfbed108fdfd1c200050428238060b22e17738fc94cda
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=ferrioxalate%20actinometry%20pdf'. Additionally, it exhibits a PDF link farm pattern, with many links hosted on cdn.shopify.com and other domains. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, also contains the malicious URL, reinforcing the 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.com/wb?keyword=ferrioxalate%20actinometry%20pdf
    • http://files.fincast.com.au/uploads/1/3/1/6/131607158/napiwewatidoren_lonotafegigev.pdf
    • http://ganonukud.stmarybythesea.com/uploads/1/3/1/1/131163599/8116933.pdf
    • http://files.philanthropy1.com/uploads/1/3/1/3/131383837/lifixov.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/type_casting_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/88527700082.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/96067091899.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/71689473074.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/minecraft_item_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/anatomy_of_earthworm.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/nofumavokofaziveta.pdf
    • https://cdn.shopify.com/s/files/1/0436/9465/3595/files/consecuencias_de_la_mala_alimentacion_en_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/35681048365.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/zuzimirupukibozim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/wefodigen.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_off0000bc17.bin
6e37f9c34623c50823cfb1735fb0d93464c5909bd61020d78866e2959468233b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 5248 bytes
font_01_sfnt_off0000cdee.bin
c606fe5323550781482f4e82acafff590d0fbdba9ce9f3f0fcba23d570aea02e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 10860 bytes