Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb9f6218c6cf5e4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 04:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18712cfb2a5e791d31f886a0b77b62b SHA-1: 2d38c140bfcdea1cd17f7bb1149900cf662e4f0b SHA-256: 4bb9f6218c6cf5e41949f62b2d9d9c92154a2e51307811a75a9675242c72788b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains references to 'yearly calendar 2019 excel' and a URL that aligns with the malicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially improve SEO for malicious content. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=yearly+calendar+2019+excel
    • http://pitilodu.truccoaustralia.com/uploads/1/3/1/0/131070872/b2436c0e234b1.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/performance_evaluation_sheet_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/31331552486.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/vexegujufejafozuwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/tomebivenurafowowowud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/netflix_video_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/melexibazizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/answer_key_flyers_1_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/game_tencent_android_terbaik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/tulawubunewowuwenepari.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/reynolds_adolescent_depression_scale_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/37027736205.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_off00005f88.bin
86b1e4d1bf8770caa70ca631c10549f4ffb681013357ef0c8940d666a5c38f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F88 5368 bytes
font_01_sfnt_off000071e5.bin
fff13fc6163aaca026587413b6e687f705a5c7abaedcb2ba99aa9be39d4ad451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 10672 bytes

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