Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36c132e0306be7b…

MALICIOUS

PDF

46.6 KB Created: 2020-08-03 19:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11036a03530a483935e9f80d37db6dc5 SHA-1: 98d3cf81d497a3137507b2ff233859b5e36ac44d SHA-256: b36c132e0306be7bb21db87f01cc582a5a9d5485c54976a9ea118546ea9066ca
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/wb?keyword=create%20maintenance%20plan%20in%20sap%20pm%20pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier strongly indicates maliciousness. The presence of many Shopify-hosted PDFs suggests a link farm for SEO poisoning or traffic redirection.

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/wb?keyword=create%20maintenance%20plan%20in%20sap%20pm%20pdf
    • http://files.melanieguerraphotography.com/uploads/1/3/1/4/131438464/c18b6e44e44.pdf
    • http://nemago.beautiquestyles.com/uploads/1/3/0/8/130874104/0c86f1e.pdf
    • http://files.perrykomdat.com/uploads/1/3/1/3/131379894/norimepanere_dumifufakopaxi_jufix_nabonutud.pdf
    • http://files.temeculavalleyvegansociety.com/uploads/1/3/1/8/131856039/kuzinunumi.pdf
    • http://files.melanieguerrap
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/36560202503.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6414/files/gopawokojupezob.pdf
    • https://cdn.shopify.com/s/files/1/0438/4587/7922/files/70922344805.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/mazotogafobizifajolofuva.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/31100367415.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/zepabosizumogowape.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/kurejutizavofubozaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/lurudewapanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/wolivalakup.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/zumba_wii_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/larabobed.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/calculus_early_transcendentals_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9929/0776/files/manual_snow_plows.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/43533721596.pdf
    • https://cdn.shopify.com/s/files/1/0429/1205/5463/files/7247483470.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_off000071c1.bin
d4e34ddf40b049b7d3c2d6f4a44738674a84e723741f57028bfdf854b51f766a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 5208 bytes
font_01_sfnt_off00008358.bin
b82122b03b2fca24c70669d5b0feda86245133ff0e5f1bb430b8ad54c1c6656a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8358 13128 bytes

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