Malicious PDF — malware analysis report

Static analysis result for SHA-256 819f76c14f390413…

MALICIOUS

PDF

41.6 KB Created: 2020-08-12 11:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc16b51d486385ab7c4c426356742268 SHA-1: 8f6851abd19cb769ae7e675de10438a544b0d17b SHA-256: 819f76c14f3904137a19849156f4d1ed4195fb04b3b6507331b776095e8ccd5a
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'ebook pdf' and a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of multiple Shopify URLs, some marked as benign, suggests an attempt to blend malicious links with seemingly legitimate ones. The primary malicious URL is https://ttraff.ru/wb?keyword=adda247%20banking%20awareness%20ebook%20pdf, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=adda247%20banking%20awareness%20ebook%20pdf
    • http://sipadegu.iedaconnectus.com/uploads/1/3/1/4/131483083/jonebufara.pdf
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdf
    • http://files.montreuxatfc.com/uploads/1/3/2/3/132302732/pamofolusu.pdf
    • http://files.capes4kidsdfw.org/uploads/1/3/2/8/132815752/vaxiduw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/wigabafiriwasitemekugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5911/files/joruvorejiwatasitunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/kayla_itsines_bikini_guides.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/ceh_v10_certified_ethical_hacker_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/40348612479.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/59536788932.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/zixatam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/rebaxoxokivomifogalolorib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/futelukuvefob.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_off0000598d.bin
a1d41f2401583f25476cae1ef1a16a6d51d966da65b022e5d6b042e570b1fe24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598D 5760 bytes
font_01_sfnt_off00006d4f.bin
cf0d8fb5527eae19401dfc12654250517e7a38e3cc95ac791bee53c0147e1778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4F 1972 bytes
font_02_sfnt_off000076c2.bin
d1e7ce07ea1a9a9f1b570930a59c973c9147e79105a706448cef69bc45b3ee65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 10048 bytes

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