Malicious PDF — malware analysis report

Static analysis result for SHA-256 66134fac3bb03381…

MALICIOUS

PDF

49.0 KB Created: 2020-08-03 09:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16881713102e288fd377c90850e992d SHA-1: f2f14507309b3b736f4d91a0a10808cf6c9ab024 SHA-256: 66134fac3bb0338163c44930be772611291c0af520544d3eec6d0dd0dee25bac
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to checking Python versions, suggesting a lure for users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links further supports a malicious intent, likely to redirect users to harmful content.

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/pify?keyword=check+version+of+python
    • http://files.sotheycangohome.com/uploads/1/3/0/8/130874403/gukedinemoxepuj.pdf
    • http://files.backstagenb.com/uploads/1/3/0/8/130814535/6225992.pdf
    • http://files.mothermoonwellness.com/uploads/1/3/1/6/131636725/milekafixevi_kugefet.pdf
    • http://welilan.vbptandwellness.com/uploads/1/3/2/8/132816066/86a6388f.pdf
    • http://files.stcharlespilgrimages.com/uploads/1/3/1/4/131438500/0a599d3808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/62781330672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/47313823226.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/49992715561.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/mivovupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/circle_of_life_elton_john_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/63134445676.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/nagajexuroduwok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f56.bin
251fb5c71801a87ebf6c3fe7e65812d0e99ac72d7fc71730c591a98518b17de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 4992 bytes
font_01_sfnt_off00008056.bin
0e52a5d9ea07c8b5fbf84441a08fc58c426174ba1b4714b803621cefe22ca0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 3508 bytes
font_02_sfnt_off00008e24.bin
485f963c6c7ce81ed7488b815af82ae03b4d268952d8bcd903cbd8816974ae2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 12440 bytes

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