Malicious PDF — malware analysis report

Static analysis result for SHA-256 87002c84077a5387…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 03:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c03930239c685e2135b0a78aa0431801 SHA-1: 717fc5addd7fb90d7a0bcc8f1da39b0589b6ed02 SHA-256: 87002c84077a5387e6e90a64b161cc200f9d6aee0f17ca029f28604ebe28fd14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link farm. The primary link, https://ttraff.cc/pify?keyword=carinosa+dance+literature+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'carinosa dance literature pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link farm. The ML classifier also strongly indicated maliciousness.

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=carinosa+dance+literature+pdf
    • http://files.cikopano.net/uploads/1/3/0/7/130776498/lilinivovufotokenej.pdf
    • http://files.mcvickardesign.com/uploads/1/3/0/7/130775784/5811235.pdf
    • http://minuru.louiseexplores.co.uk/uploads/1/3/1/3/131379730/xuzunajuxebemorodade.pdf
    • http://files.xn--cafer-dsa.dk/uploads/1/3/2/7/132740293/9fddcda241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/gelezufozesazaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8615/0816/files/rapid_sand_filtration.pdf
    • https://cdn.shopify.com/s/files/1/0436/7994/0761/files/jimudivak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/xalukeninazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/ritamiwazudovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/imgur_r_amateur.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/vupomegumopujaxixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/zidimix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/cerebrospinal_meningitis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/ruxadil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9352/files/miliza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d79.bin
13499e363e2aa30e4b0a6277184de1b02605a0277d8b1dd05492c9b85f753abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 5052 bytes
font_01_sfnt_off00007eb1.bin
eaff306b3da7ad9ced3058ee02f20c86ae64ab46c71467bca19635f220c543ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB1 10688 bytes

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