Malicious PDF — malware analysis report

Static analysis result for SHA-256 0845238edb54f96d…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 07:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5abfcae7515168aac2b4e5deabfd115 SHA-1: 5edc6b8016eae784b4c220db477d8af5312fe925 SHA-256: 0845238edb54f96d83fb0f079bf12c5faba0734f1f470f3558eae1f2dc79b8b7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to 'Android message app icon' and the malicious URL. The PDF also contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. The ML classifier also 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=android+message+app+icon
    • http://files.caninemannerscpt.com/uploads/1/3/0/7/130738696/886acc31f41.pdf
    • http://files.droptailgateband.com/uploads/1/3/0/7/130776728/7139164.pdf
    • http://files.drjohnnylops.com/uploads/1/3/1/1/131163666/gusugavu.pdf
    • http://files.linhr.com/uploads/1/3/1/0/131070189/tabotusatoboza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/29025700676.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/zefeluluwebaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/64827595299.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/voniloduravi.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/declutter_your_mind_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/8610/6014/files/pdf_to_docs_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/37759993000.pdf
    • https://cdn.shopify.com/s/files/1/0428/7820/6111/files/29266678370.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/90315054147.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_off00006199.bin
51618ae36f1e011bb08acbc34854b5fc2aa9c044bf6adafd990225020659be0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 5352 bytes
font_01_sfnt_off000073ac.bin
b5a182ed1ae84b0ea10562c75f73df84816f40ed884bcc672d91182eb2c13764
pdf-font-stream PDF embedded font (sfnt) at offset 0x73AC 10292 bytes