Malicious PDF — malware analysis report

Static analysis result for SHA-256 b605138ffca61ea8…

MALICIOUS

PDF

46.3 KB Created: 2020-08-20 01:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca21dc941b23007b9054eceaa608b77 SHA-1: e8025d7171b582d594f84000bce624f020439250 SHA-256: b605138ffca61ea85aa086b441c0a2c7fd2b3770fce7d241e24587b9ab0e084c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'design patterns explained pdf free' and the authoring application 'wkhtmltopdf', suggesting a lure for users seeking such content. The presence of multiple PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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=design+patterns+explained+pdf+free
    • http://porevowag.twobeinchili.com/uploads/1/3/0/7/130775364/rewesofekokibisu.pdf
    • http://files.stevescustomcarpentry.org/uploads/1/3/1/4/131437980/vuxuliwexozirajub.pdf
    • http://rixevo.lovethetruth.co.uk/uploads/1/3/1/6/131606552/jarutakuxawalajodag.pdf
    • http://paxajet.oxfordstation.pl/uploads/1/3/0/8/130814328/98556.pdf
    • http://goberabav.mustbeheaven.com/uploads/1/3/1/3/131383434/4583544.pdf
    • http://paxajet.oxfordstation.pl/uploads/1/3/0/8/130814328/
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/3603437285.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/78427687755.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/24293501716.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1143/files/84495393816.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/gebanexurew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7343/files/zupazulisabanepitejudad.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/asthmatic_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/polodejalaruzutofepij.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/18488724045.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/vasozevasolefabu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ba4.bin
6a89c39c443ddc2b653f3ef5dca6aacac1f3c135b06134a24290b7bcc483b6a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA4 4956 bytes
font_01_sfnt_off00007c89.bin
7e436e6978b1255ea7e9fe1be6b5ebd257aade2765f5df9d2d409a5a7177d4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C89 9816 bytes
font_02_sfnt_off00009df7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF7 4324 bytes

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