Malicious PDF — malware analysis report

Static analysis result for SHA-256 13675b81358ab638…

MALICIOUS

PDF

38.1 KB Created: 2020-09-11 17:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771e3f9747ebe977c8e974167b362478 SHA-1: 18945a6a61e08f6ca0762142c0c3faa966c0e67f SHA-256: 13675b81358ab63848e58f96e4dda65fc69ae65ed95c40ed06a84b6e7d5ddeae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.link/wix?keyword=annamayya+sankeerthanalu+lyrics+telugu+pdf, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The ML classifier strongly indicated maliciousness.

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.link/wix?keyword=annamayya+sankeerthanalu+lyrics+telugu+pdf
    • http://files.makeupbysherrijo.com/uploads/1/3/1/8/131872087/7267640.pdf
    • http://files.globalubuntu.net/uploads/1/3/0/7/130775245/4076056.pdf
    • http://files.wagsbarkery.com/uploads/1/3/0/9/130969188/d449df692b.pdf
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f65518_94c69d2f48124aa59ae37bada546d666.pdf
    • https://static.usrfiles.com/ugd/77941b_5a993a6babf44680a251232976b97a23.pdf
    • https://static.usrfiles.com/ugd/834936_94f5d3965b6047579d7ca46be05b1800.pdf
    • https://static.usrfiles.com/ugd/5262df_127729f4db804104b9213b7b85bca158.pdf
    • https://static.usrfiles.com/ugd/3c2e2e_d779b49e9bff4c9daf019cf16d52076f.pdf
    • https://static.usrfiles.com/ugd/764aaa_d62f328b6504495c950f4c1a25630263.pdf
    • https://static.usrfiles.com/ugd/0251f0_9bfe56f0f1ed44e59fbc27de64b15bc9.pdf
    • https://static.usrfiles.com/ugd/ffe0d3_fb5324565d7241d0b956f0a8f2d06df6.pdf
    • https://static.usrfiles.com/ugd/11baf9_f636ca62a6bf49f1a9ce8b26cf1fcc10.pdf
    • https://static.usrfiles.com/ugd/b2ba6b_a6d2dee3053a40f2a35056220e0b496d.pdf
    • https://static.usrfiles.com/ugd/7dfe85_abc96ea1dd664efe839dc7f2c3ffbc73.pdf
    • https://static.usrfiles.com/ugd/b1b3ad_211ed6e9c0aa4551988abd12cedd2eea.pdf
    • https://static.usrfiles.com/ugd/74a852_c029052fcfe14549b500c45c8078e914.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005581.bin
13422bfac52fa534aaddbdd8066e46f58823fe8c7d92c0f1e8b563fa38c64bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5581 5724 bytes
font_01_sfnt_off000068ea.bin
84e3d9799499f73551a15f4bd9c3ac1f9cc93df31c5dfc4b089a119b72da558e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EA 10088 bytes

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