Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7f10af469c6e88…

MALICIOUS

PDF

39.3 KB Created: 2020-08-10 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b00fded5ece6264e92a9e3b86e0d0ab SHA-1: fb1107a4283353271584dbdbe51fea99091fe76c SHA-256: df7f10af469c6e88b194d50d22fa39e9d05bf6d0a75d85080f2c71d8fa48d427
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=asam+criteria+assessment+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which host benign content but are likely used to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'asam criteria assessment pdf' and the authoring application 'wkhtmltopdf', suggesting a lure for a document that is likely not what it claims to be.

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=asam+criteria+assessment+pdf
    • http://fifitoser.centerforburmastudies.com/uploads/1/3/1/6/131606349/lawifufoda_dadavumufotiwu_gunibox_nolesodavuxu.pdf
    • http://rozufibo.sowilocommunityhigh.org/uploads/1/3/1/4/131407469/669638.pdf
    • http://files.silveroceangroup.com/uploads/1/3/0/7/130740443/5345398.pdf
    • http://files.burrow.nyc/uploads/1/3/1/4/131409128/980424.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/1714212080.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/51893517484.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/56887027128.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/gadipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/lovufabemiwavivimigare.pdf
    • https://cdn.shopify.com/s/files/1/0432/4225/8587/files/building_materials_and_construction_practices_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/chaitanya_charitamrita_bengali_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/avicenna_ibn_sina.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2273/files/27559615912.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_off00005af0.bin
d6b842176adfc9771bd3cb1e8b9e27dcb2bae49e0f0f28a5a971f6a91bd16142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 5260 bytes
font_01_sfnt_off00006cbd.bin
7bf54970b01707fd0b861c14bf4281e35d87cc33ecf421fd2748661ca547ec5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 10564 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.