Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af4dc194fe30fd5…

MALICIOUS

PDF

34.9 KB Created: 2020-08-31 06:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbdddfe91b9723a6a9e70a616ea636ec SHA-1: f25d76253bd2cf5f0d1adcb715d241b3a1196a57 SHA-256: 4af4dc194fe30fd5bb1339a3b8c05644babb202a72715b5ac794d9ed13fb4a0e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.cc/wix?keyword=nanoleaf+aurora+price. The document body, though heavily obfuscated, appears to contain keywords related to product searches, suggesting a phishing lure. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=nanoleaf+aurora+price
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/35324066674.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/balubopewazifidega.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/rinumubegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/fofifozikogifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7312/7079/files/72211995375.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/xanoride.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/carton_packaging_design.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/jujalazenajakavuvuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8472/5926/files/71373335959.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/p_g_reasoning_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/jexaxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/zexoraf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/gmail_all_emails_with_attachments.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/perimeter_of_shapes_worksheet_ks2.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_off00004d3e.bin
ace1916379667c313c86b7e3870629af13b240d382a55cacd624b7ed51af9454
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3E 4800 bytes
font_01_sfnt_off00005da3.bin
9929afae4b84f406d707172489c01a06beee282172088b7892047bbb4f775e61
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA3 9920 bytes