Malicious PDF — malware analysis report

Static analysis result for SHA-256 4852f7edba2024e7…

MALICIOUS

PDF

48.7 KB Created: 2020-07-31 23:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b3501b4e4e98a8ed4a243337dc84d9 SHA-1: af3a17b6fe87eb73ed828b326ba71158ff283085 SHA-256: 4852f7edba2024e76b62443f6c11310744d4c2d2b368fe421b19a835b44d7b7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=csgo+viewmodel+generator, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a "Csgo viewmodel generator", suggesting a lure to entice users to click the malicious link. The presence of numerous other links to Shopify domains, while individually benign, contributes to a link farm pattern. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=csgo+viewmodel+generator
    • http://files.retrorocketgaming.com/uploads/1/3/0/9/130969573/ef0f7a2150fef8a.pdf
    • http://files.stbenedictsongar.ie/uploads/1/3/1/3/131398252/pawubupiduf-jizotazu-moliduzazemen.pdf
    • http://files.nnslscnippers.com/uploads/1/3/1/3/131398308/xigawe_darag_vawuwibep_faxogezafudu.pdf
    • http://files.lauramorrisonwrites.com/uploads/1/3/0/8/130814714/nasabetezisite.pdf
    • http://files.in2yogalapeer.com/uploads/1/3/2/7/132711999/d620982c279f.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/joxigawapeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/4687224487.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/welekarekikuvosagupuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/86264632767.pdf
    • https://cdn.shopify.com/s/files/1/0432/5277/7128/files/94821027938.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/xegoworubulix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/nasenot.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/sesadix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/49788392821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nowivozepax.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b8.bin
e26fd37b3d0337c44f914c692f496a4d9087dad554fe0bb57e2356e19b8e5033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 5204 bytes
font_01_sfnt_off0000795c.bin
2cf0acc853033eb6a94e5e3f76fcfb010af5d4fd6d56f4150a00b5237f2161cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795C 11016 bytes
font_02_sfnt_off00009eaf.bin
2a247a753e8a01f70d7fcfa74e2d7baad7259a755652018209d99d19020bd12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAF 16332 bytes

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