Malicious PDF — malware analysis report

Static analysis result for SHA-256 7839e7ebd5bd58d9…

MALICIOUS

PDF

36.7 KB Created: 2020-08-29 18:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0586a0df3234edba848f45a9e1ccde1 SHA-1: c8897866e729fc9d0e1b58c203b6ee47a5d50030 SHA-256: 7839e7ebd5bd58d9dfa0898280b4912bffba67e34b9e144b45b3cee0ebf4df71
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that likely serves as the lure. The presence of many Shopify links suggests a link farm used for SEO poisoning to attract victims.

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/wix?keyword=discrete+and+continuous+worksheet+pd
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/fudigukiwoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/kifabewilepikujuxakov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/fagiwinib.pdf
    • https://cdn.shopify.com/s/files/1/0454/8267/2278/files/bulifewaxujolivopegaboj.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9aab1ea555f4ade8233506bd1f3e827.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c74718e4fbe434ea351fb67400623f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d92bc9f4daa4d878bcc42df02d6ec80.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6c190f4b6494997a8f83f845ef1045a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59af30eb9f6470893edae8e0cee8a7e.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/kotefaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/41777067212.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/78372227838.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/misilol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/shyam_baba_images_hd.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_off0000535a.bin
ff8cf70b42b2cf44f376cb5bc2117ebee8d0a1a593e93b9c1945314fe4be8b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 5284 bytes
font_01_sfnt_off00006558.bin
a4100acb3ac79febfa251f8122c9fa2588447a91fd4977a1e72951ada09abc09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6558 9636 bytes