Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c4b8b3b7c86e53…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 09:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c01c69b674abcd7d555861f5377f530 SHA-1: 0eacc99d2d804673ee2e96cb1306e57f426e4456 SHA-256: b0c4b8b3b7c86e53bc4feabd0aef18bb18a311065f7ba572705ddfd47501de38
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for downloading a syllabus, which is a common tactic for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/pify?keyword=rrb+stenographer+syllabus+2020+pdf+download
    • http://nugisafez.mrwallacesmath.com/uploads/1/3/0/7/130775219/kirapuv-fipax.pdf
    • http://files.kalinabg.com/uploads/1/3/1/8/131857626/3604724.pdf
    • http://files.cornerstonechildcarepreschool.com/uploads/1/3/2/7/132710717/tixalonepokel_nakekadire_xudawet_lorep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/31629897358.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/20822222078.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/8049717157.pdf
    • https://cdn.shopify.com/s/files/1/0443/9523/3446/files/plural_of_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9633/2705/files/tebemijexejugaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2197/5197/files/78530265890.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/gujubomusofiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/64913405738.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/python_find_in_string.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/asdfghjklzxcvbnmqwertyuiop_asdfghjkl_zxcvbnm.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/90786537258.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_off000064f5.bin
1635ffa8599f6554cbcb76cfa6461c9852e84c6d938c2e250c2e2ab030dcf876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 5920 bytes
font_01_sfnt_off0000792c.bin
740980168b497ae017d51f1f66b396c4c90ea09f77978cb43cea48b20a76877a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 10468 bytes
font_02_sfnt_off00009d03.bin
7d81920377ed8db76b1cb2ae8e26634ad5f44eb4115fb37f61fdccacc8c8b56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 4260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.