Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6ef3c5900ea652…

MALICIOUS

PDF

49.9 KB Created: 2020-08-02 14:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71ac487d59334125e0450be311341e4 SHA-1: 545f61610db2594147e1bef75bee238920e30717 SHA-256: 0b6ef3c5900ea6521c661eed1008bd1cd6d56a0b82e6324f458734212cf7caac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to drive traffic to malicious infrastructure. 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.com/pify?keyword=gm+part+cross+reference
    • http://files.thepolisheddistrict.com/uploads/1/3/1/6/131607063/wadakavubulip.pdf
    • http://files.rusticfoxworkshop.com/uploads/1/3/1/3/131383314/wopavewixi.pdf
    • http://files.quinkydinkdonuts.com/uploads/1/3/0/9/130969194/jozop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/virtualbox_shared_folder_linux_guest.pdf
    • https://cdn.shopify.com/s/files/1/0440/0431/1190/files/1344619984.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/gazojonopofivuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/46383325176.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/79038277067.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/naweluwutasesojowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4141/3527/files/wudan.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/gosefurazalaruvofuvas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7943/files/jinutumolojazusekuga.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/38047312343.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/9807073218.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a52.bin
a268e4416f1cbd5b4ba857b6f0c83b22048164fdf50b2e8f7fbafb24e92a141f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A52 3292 bytes
font_01_sfnt_off00007624.bin
d8ba7b7ccde807117e445677677b2e4131ea4cff81355a22e114289836133c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 4900 bytes
font_02_sfnt_off000086a5.bin
8540709d131b57e0e383c8f14ed23719063205c904ee54e90eb6be939d06365a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 11740 bytes
font_03_sfnt_off0000ac10.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC10 4324 bytes

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