Malicious PDF — malware analysis report

Static analysis result for SHA-256 665baf40216a06a7…

MALICIOUS

PDF

45.0 KB Created: 2020-08-04 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b562a81ada88a112c8293d1e70af18 SHA-1: f42f62f95f8b1e4166f8cfe44f10d64b63907b0c SHA-256: 665baf40216a06a75e657cd6bb90028fa78c9403617c0eb5af156933b40ea273
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the URL that leads to this redirector, suggesting a phishing or scam attempt. The presence of many external links also indicates a link farm, potentially for SEO manipulation or distributing further malicious content.

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.cc/wb?keyword=daily%20life%20in%20ancient%20china%20pdf
    • http://junetiz.goethefruehlingsfest.com/uploads/1/3/1/3/131379730/texevode.pdf
    • http://files.retropubsigns.shop/uploads/1/3/2/7/132741029/kumal.pdf
    • http://files.hightechtintplus.com/uploads/1/3/0/8/130874339/1430434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2128194791.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/golazabenofumirifug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/91384876821.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/sujolefeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/autodesk_plant_3d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6172/9685/files/48898237645.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/volatorarobak.pdf
    • https://cdn.shopify.com/s/files/1/0440/4323/9589/files/lightfoot_halfling_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/42448199289.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/62155913968.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/rerejepeforewaworateborew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4637/0471/files/60572512501.pdf
    • https://cdn.shopify.com/s/files/1/0428/5621/8780/files/thesis_on_islamic_banking_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/86783601335.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8632/files/96781080169.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_off0000741c.bin
5c6db87b252ecbde27fca2a6ad3f4ea51e62a68465bd06ea8d9ed665b44e196d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741C 5072 bytes
font_01_sfnt_off00008571.bin
84144c8fb30ddb5d1d1845f93135b4784d632bcc847c4c54db0fd52dd5e3c775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8571 9708 bytes

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