Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4ac8a34c89f3e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-16 21:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb8f7b92673add6a058d09442e89f0c SHA-1: 85020d11f0243429d3d0c118f71e9c643f78b289 SHA-256: 0ca4ac8a34c89f3ef9a8ac2761717d1d81bc563f77213b038aeeb6134fa77476
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or redirection scheme, potentially to distribute further malicious content or for SEO manipulation. 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=azagaia+abc+do+preconceito
    • http://gulinas.recoverycafelafayette.org/uploads/1/3/1/3/131398360/fujukameku-mizejunuloz-netumidutamej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9722/5368/files/bukapesiwuwirisegasatatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/41617305715.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/xuwanesufiraguruposox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3827/6760/files/94455231231.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/11506609336.pdf
    • https://cdn.shopify.com/s/files/1/0428/4842/0007/files/9418099187.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/79145014569.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/csma_cd_and_csma_ca.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/fortnite_cheat_sheet_boogie_down.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/nabedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/gutitukibexazuluvitovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9665/files/20088553816.pdf
    • http://azagaia.bandcamp.com
    • https://itunes.apple.com/us/album/cubaliwa/i
    • 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_off00005bd9.bin
d01bb0b1fc95b6fa51d5f3e8adb549abb91b3d5cc58c824b8847786938ee6f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 5212 bytes
font_01_sfnt_off00006d99.bin
bc71b0ee25b236e085a1b8cb5025746a74ebbb4dca5099307e0bc05eb06d2fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 10440 bytes