Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31780995d0ef42f…

MALICIOUS

PDF

37.3 KB Created: 2020-08-13 03:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a6f3654873c20f40aaeb4e97e41d70 SHA-1: 594e12f31c2040b9cd0b81ca76ce36b6da95aea5 SHA-256: b31780995d0ef42f50b682c1bdd9c3eb47933ac4f634756da93320b79477c2c5
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=biology+revision+questions+pdf', suggesting a lure to disguise malicious activity as educational content. The presence of numerous links and the ML classifier's high confidence indicate a deliberate attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=biology+revision+questions+pdf
    • http://files.sambeafarm.com/uploads/1/3/0/7/130739628/b35986ef45730.pdf
    • http://files.whitemountainacfchefs.org/uploads/1/3/1/8/131857723/lewosukomunogike.pdf
    • http://wonujemi.womensoutdoorweekends.co.uk/uploads/1/3/1/3/131379678/wusejudizuje.pdf
    • http://files.ecautoelectric.com/uploads/1/3/1/4/131437005/sizedivorolapasa.pdf
    • http://pojonale.hazelandbluedesignstudio.com/uploads/1/3/0/8/130814328/dafavurusebibifodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9333/5970/files/xorokaxi.pdf
    • https://cdn.shopify.com/s/files/1/0450/6501/1352/files/java_programming_for_beginners_using_eclipse.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3224/files/49974119521.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/39256232157.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/996289449.pdf
    • https://cdn.shopify.com/s/files/1/0430/6806/3895/files/luvifesasaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8759/files/application_format_for_leave_in_office.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/46784626454.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/e5_a4_aa_e9_99_bd_youmaker.pdf
    • https://cdn.shopify.com/s/files/1/0437/6965/9549/files/d_d_manual_of_the_planes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2429/files/duwofidubekav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000527c.bin
a667aa6305ed33d7af9c8358c1764693bd9eabcd3355fc973276e70f78ea2dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 5336 bytes
font_01_sfnt_off000064ba.bin
2d18501a4f534ab4eda105c8ef4faaaf772f6258e4fd0c0ff41ef05874c48dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 10496 bytes