Malicious PDF — malware analysis report

Static analysis result for SHA-256 1266d2940c2a1f45…

MALICIOUS

PDF

32.9 KB Created: 2020-08-17 11:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c7ef2be89ea61f46c9a46eb7fffc8f8 SHA-1: 6ba1fb141b6bfb0d00c81e30184322e01b8de170 SHA-256: 1266d2940c2a1f453a7dfc98a38eda25d1d3906e71b53c8e7330b3150d3bc52a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm, suggesting an attempt to drive traffic to malicious sites. 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=worksheets+on+earth%2527+s+rotation+and+revolution
    • http://files.mcclure-insurance.com/uploads/1/3/1/4/131437123/venivofogel_vadifamozuxe_lanolijumoguda_duben.pdf
    • http://files.dheifetz.com/uploads/1/3/1/3/131384777/vazokarewitadisudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/78668910868.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/apple_beta_developer_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/abdomen_agudo_medigraphic.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/pretty_ricky_grind_with_me.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/what_is_nfo_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/80746163028.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/dokenidurotogib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/kesupulujaguxisegukaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/bonuba.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/bbg_weeks_13-_24_noholita.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/17906842390.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_off00004491.bin
561c592da8f12ca50b08a8030efc72fa4d4849ee4b688bd22f7aeefb9b5cba84
pdf-font-stream PDF embedded font (sfnt) at offset 0x4491 5084 bytes
font_01_sfnt_off000055ea.bin
834c44394f589db8bcb1e655ceeb0962faa4873e8f8fb472496b3106afeddc1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x55EA 9680 bytes