Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8fdcc8fe5f9fe4…

MALICIOUS

PDF

35.6 KB Created: 2020-08-06 11:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159153ca85f345ca9027aa4fb6850abb SHA-1: 717888c5ffd6f199eab9ea850d754c88ff8619ba SHA-256: 2a8fdcc8fe5f9fe49d5b6c90430d50c03fd4806390ee8ed9c1e80feb4c229739
152 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, pointing to 'https://ttraff.ru/pify?keyword=business+vocabulary+in+use+intermediate+pdf+download'. This URL is likely part of a phishing or malware distribution scheme, attempting to trick users into downloading further malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute various payloads.

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=business+vocabulary+in+use+intermediate+pdf+download
    • http://files.moniquenicolecaston.com/uploads/1/3/1/0/131069915/sawazax_xenasugudag_jilejivo_loler.pdf
    • http://files.someday-l.com/uploads/1/3/1/3/131398177/gifubusepegere_xotiwivix.pdf
    • http://files.doublefoxx.com/uploads/1/3/0/7/130776877/masidap.pdf
    • http://kosokoged.mcguiremarks.com/uploads/1/3/2/7/132712615/1a6efad.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/36193808012.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/cyclothymia_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/acet_sample_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/4260021634.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/28640164689.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/63140152252.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/beclomethasone_dipropionate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/sekasukiwuwetiwif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5040/files/13800460690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zitadeduwifugegumav.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/11142460930.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/rebunivezofoxejexisa.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_off00004a61.bin
d111c3d172da17704c8371b2587a9336238d725edf06a679315cd87f5e812870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A61 5744 bytes
font_01_sfnt_off00005df3.bin
2d4a605d8fdcfece691f67626eb53293c93769a6220d832692b162b81d3f3ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF3 10712 bytes

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