Malicious PDF — malware analysis report

Static analysis result for SHA-256 89799a44a02781a2…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 16:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbe88ba73e031dd0ab8dacaebaed550 SHA-1: ae0fe145eec5997e4a7c4961027afa666a02c3a0 SHA-256: 89799a44a02781a2a37f43fce962110dc5b4dbef84ec2d9c90d7ad82c5eee4a1
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to a redirector service (ttraff.com). The document body, though heavily obfuscated, contains the same redirector URL. The heuristic firings indicate that the PDF is designed as a link farm, likely to distribute malware or conduct phishing attacks by redirecting users to malicious sites. The ML classifier 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=sociolinguistics+and+language+teaching+sandra+lee+mckay+pdf
    • http://files.5star-truck-repair.com/uploads/1/3/0/9/130969191/vanabuvu.pdf
    • http://files.jillhakala.com/uploads/1/3/0/7/130740128/8e8e25e.pdf
    • http://files.sparksip.org/uploads/1/3/2/6/132695566/4818366.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/70921014840.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/gre_practice_test_2015.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/87370525995.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/ceate_engine_6._1.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/tinabifaxafedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/55428907090.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/16886219667.pdf
    • https://cdn.shopify.com/s/files/1/0436/4769/7049/files/97833689524.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3699/files/55247651746.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/3669954479.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/87566744085.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/87099552364.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/43879851592.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_off00006197.bin
ed42860150c22ecde69662f4ca851127c6e1ad24fb897459f1b51a8cb4978526
pdf-font-stream PDF embedded font (sfnt) at offset 0x6197 5836 bytes
font_01_sfnt_off00007558.bin
aac2ab93d43f95924a2a79d143d831d64a8fbeaf5023d7394e8b406c98cc9e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7558 10320 bytes