Malicious PDF — malware analysis report

Static analysis result for SHA-256 11278c2678dc5e4d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 02:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1938a4f6901ad1ccba062c1634f470d4 SHA-1: 992cad463ff504eabb0db922399468d326327e11 SHA-256: 11278c2678dc5e4d1389f77bc188777fa105eb234539c1e5020f7d14faef08c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be search result metadata, suggesting a lure to a malicious site. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic, likely to obscure the malicious redirector.

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/wix?keyword=lego+millennium+falcon+original
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/spectrum_ancient_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/59381440260.pdf
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/free_online_christmas_party_invitation_templates.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/33107523652.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/gorenje_wa_982_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_581ea006585b4ab29b69a9eaba43713e.pdf
    • https://static.usrfiles.com/ugd/9f6a24_9d507dee79a940f98abbb95e92b0b99d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2180db3244694d81b05279727c28fde9.pdf
    • https://static.usrfiles.com/ugd/b8c837_70aab77c964e476e9511c4ec3e788ad6.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/26416828745.pdf
    • https://cdn.shopify.com/s/files/1/0447/9841/0918/files/59487412679.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/subugum.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/5_australian_dietary_guidelines_2018.pdf
    • https://cdn.shopify.com/s/files/1/0451/3467/6133/files/auto_dwg_to_converter_serial.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/round_robin_restaurant.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/dupesitisolijedokob.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_off00006a2c.bin
e58548fe5aaa0db3094bbd061b1bbad13fb3913502ed8663752114595cbc15cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2C 4964 bytes
font_01_sfnt_off00007b02.bin
eb4ba9997c088759aafdfe0c2e2ad89c469e9502eb537a94ff47cc7ccf14a61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B02 10928 bytes

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