Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dd16251531d014…

MALICIOUS

PDF

42.5 KB Created: 2020-09-12 07:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d9568cb5b7cb6e108d18776ebe4e07 SHA-1: 29661190a21508f5d875ae70d15d0fc4ad8b7f45 SHA-256: 68dd16251531d014018e8d53d90bfe55315ba79f60c0c71e355149d092e348ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are likely part of a link farm or phishing campaign, aiming to direct users to potentially harmful sites.

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.club/wix?keyword=android+ndk+github+samples
    • http://files.blacksheepfotos.com/uploads/1/3/0/9/130968933/fesekej.pdf
    • http://files.issueslte.com/uploads/1/3/0/7/130775405/e7eef2575.pdf
    • http://files.bloominggroveinn.com/uploads/1/3/1/1/131164122/rukabiwo.pdf
    • http://files.lisamccafferty.com/uploads/1/3/1/3/131383664/bamibitamurata.pdf
    • http://nusunog.rozannaartist.co.uk/uploads/1/3/0/8/130814328/rowel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/accd1f_35ee17ab1c6e40bcbf6044228dd01de7.pdf
    • https://static.usrfiles.com/ugd/277b62_ee1dad4e61754a298dc1b0c93187f014.pdf
    • https://static.usrfiles.com/ugd/0789d5_b173440356334cdf9ab2d41f00c669e3.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/82884261445.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/the_isle_giganotosaurus_guide.pdf
    • https://static.usrfiles.com/ugd/238140_236614b3298644f7b3e62cfa1d6f0184.pdf
    • https://static.usrfiles.com/ugd/d55797_79fcae23ecb648b4836c5700e7064d10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da5.bin
619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA5 2880 bytes
font_01_sfnt_off000067e3.bin
808014be7fc99d8dad582be8b62bc02f6a97560ca187764d8cd43c06d8fb80c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E3 5564 bytes
font_02_sfnt_off00007aa4.bin
223fbbdcaf59e15c90474159e4a6a389e2b419bdc683c58d83b9d31f0554e2cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA4 10144 bytes