Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5266a1b1ff4884a…

MALICIOUS

PDF

34.0 KB Created: 2020-08-21 03:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b8c1d9e6c597bbca183d09fabddbaf SHA-1: 3d5e1764e838aae9cf9793fa7c37e2468ec2a1c0 SHA-256: a5266a1b1ff4884a7b79ab94f7d16d0a9dff9e2f2e1466885a58d2ed6b8cd904
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL. This indicates a likely attempt to redirect users to malicious sites for phishing or malware delivery. 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.ru/pify?keyword=bajirao+mastani+telugu+full+movie++480p
    • http://files.pivotaldancecompany.com/uploads/1/3/1/3/131380337/maxadulitikewutomup.pdf
    • http://files.ultimatedoubles.com/uploads/1/3/0/7/130739399/73cd0ddd.pdf
    • http://files.virlinafuture.org/uploads/1/3/0/7/130775465/pozebu_talojokirix.pdf
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/44704226932.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/xigeverolerebudumisotix.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/73389577482.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/add_and_subtract_fraction_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5382/files/85795485203.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/13935678703.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/vegikewuvaril.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/31637284737.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/rinabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/mamobakovawinenuseza.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/veruposi.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_off000045cf.bin
e0a0715b889b09d870dd0cb217d4d3723fb0c7d9f1adb5cd14b330ef51ea345d
pdf-font-stream PDF embedded font (sfnt) at offset 0x45CF 5828 bytes
font_01_sfnt_off000059a2.bin
e7665067b439656f228980fcc072c9c856d09550120c87061fe67d7ae8cccfff
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A2 9756 bytes