Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc90aaa5552511c…

MALICIOUS

PDF

71.4 KB Created: 2020-07-22 23:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a97d881fecf7756acab93f305078c5e SHA-1: 5f0860ee6122d26e33ff5d541af9cf68f55ab76d SHA-256: 1dc90aaa5552511cbef42ca442820a51a22b6751b228c43b1b2cf810402c7cdd
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous embedded URLs, including one pointing to a known malicious redirector (ttraff.cc), suggests the primary intent is to lure users to external, potentially harmful, sites. The large number of Shopify-hosted PDFs further supports the link farm detection.

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.cc/pify?keyword=bill+of+rights+1688+pdf
    • http://files.tomwellereditor.co.uk/uploads/1/3/0/7/130740097/9582433.pdf
    • http://files.fernholzcrop.com/uploads/1/3/0/7/130776296/4574047.pdf
    • http://files.karenepoirier.com/uploads/1/3/0/9/130969503/zetak-kopigeru.pdf
    • http://files.kettlecoveicecream.com/uploads/1/3/1/4/131437443/83cd7.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/tipisonegebajefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/toraxigafibimuwarubokodeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/77071309202.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/zizofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/xovomes.pdf
    • https://dopuzifiza.files.wordpress.com/2020/06/25538228866.pdf
    • https://lamutenusut.files.wordpress.com/2020/07/56123131551.pdf
    • https://vowivol.files.wordpress.com/2020/07/xikeboje.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/jatujerigefemik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/43787072159.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/39844036537.pdf
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/pewazago.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/xamikolovig.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/3247393632.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/7886852219.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/11626253673.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/jepogagorakesawire.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_off0000db4a.bin
ee6c58cd6634d3a38c96bb735e7b8f8a470091d5da13b70769eeed7b9217b836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 5104 bytes
font_01_sfnt_off0000ecb5.bin
bb61a80b8f483557c2be0ed93a3ab4c8dbeec970ee3ac57116416da84140737c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10356 bytes

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