Malicious PDF — malware analysis report

Static analysis result for SHA-256 8794990dc88df515…

MALICIOUS

PDF

42.2 KB Created: 2020-07-26 05:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1664fba4b7163c5272f916e4f238d213 SHA-1: 4b6ea613f9256354ea718466ef6700f4aa7e074d SHA-256: 8794990dc88df5152adf8289e1133606154d7683f2288e6edaa7b0a34553892e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Whatsapp status video song free mp4', suggesting a lure for potentially unwanted content or phishing. The presence of numerous external links indicates a link farm or redirection strategy.

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=whatsapp+status+video+song++free+mp4
    • http://files.ladderrus.com/uploads/1/3/0/9/130969339/8116569.pdf
    • http://files.audrinabellwarren.com/uploads/1/3/1/3/131379724/364753ee.pdf
    • http://files.saikyokarate.com/uploads/1/3/1/4/131406104/5ca711.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5430/0312/files/kufunizezogun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/wozufet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/50360839529.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/redemoluzomitetas.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1075/files/povuxiwinurajumavotagote.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/48934454026.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/48853916913.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/79628509917.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0521/files/20267222028.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/kaxifapizubilegupeguw.pdf
    • https://cdn.shopify.com/s/files/1/0437/3331/9831/files/kerigumagumatibafeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/zekutisisikof.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/lojovepojarak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.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_off0000671e.bin
ae2b419abbd486b4eb779549a518df3e38c36635d953967f1cdcd0726609609a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671E 5468 bytes
font_01_sfnt_off0000799b.bin
e9724b8ed5cc3849bcf35aa9a5f0bebc80fb7f86f2bcb4cca81c0136fa307cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 10024 bytes

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