Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7fa5d5df4f0260…

MALICIOUS

PDF

46.8 KB Created: 2020-08-17 00:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded7685289a44c67421d0d11d00b5be3 SHA-1: 1bd0a46006249ee89e0706bce227f5914083d62a SHA-256: 9e7fa5d5df4f026017deb69e2ed1cd4620d2c632eece464b1e44cd11747733fc
152 Risk Score

Malware Insights

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

The PDF contains a title suggesting a worksheet, but is primarily composed of a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body also contains this URL and a large number of other external PDF links, many hosted on Shopify, likely to obscure the malicious redirector.

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=endocrine+glands+labeling+worksheet
    • http://files.gsmtennisexperience.com/uploads/1/3/1/3/131397987/zejusiwitidi.pdf
    • http://jafes.bayareahomeschoolfair.com/uploads/1/3/0/7/130776661/januzumarejoje.pdf
    • http://files.perroneboatdetail.com/uploads/1/3/0/8/130814110/8546316.pdf
    • http://nutujik.vedvalmiki.com/uploads/1/3/1/4/131437607/6c0df14e889.pdf
    • http://files.dangshades.com/uploads/1/3/1/3/131381976/2641574111ab175.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/67532435245.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/vms_peopleclick_com.pdf
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/manual_miter_saws.pdf
    • https://cdn.shopify.com/s/files/1/0437/6923/3565/files/applied_mathematics_1_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/55815852663.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/8929540574.pdf
    • https://cdn.shopify.com/s/files/1/0434/6970/1280/files/93137523754.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/82230666213.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/64930780357.pdf
    • https://cdn.shopify.com/s/files/1/0450/5636/0600/files/79696059061.pdf
    • https://cdn.shopify.com/s/files/1/0434/4840/2081/files/geometric_transformations_iii_yaglom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cc3.bin
a3017de2f53c0b66c31096584afb1554833f5a957733fec960394c93ca9208a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC3 5240 bytes
font_01_sfnt_off00007e97.bin
1062be071f9e22f54a03e2679d9cf50d9d78d8f358ace353c6f6e1f325c6bb31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 9840 bytes
font_02_sfnt_off0000a037.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA037 4324 bytes

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