Malicious PDF — malware analysis report

Static analysis result for SHA-256 6753c6a07d63397f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-16 22:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb81d2295e0bd2f9882d52157ab04e79 SHA-1: a69ae42103b542533fc7f7ed13b8aaaa0abf17ea SHA-256: 6753c6a07d63397f8d07756fe3588b4906b8ac56e0b063815b317b02c3c6ea4a
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or to download further malware. The presence of numerous PDF links and the redirector URL indicate a link farm or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=call+ringtone++iphone
    • http://siwugiv.bolognareview.com/uploads/1/3/2/8/132815176/8340758.pdf
    • http://files.russianguideservice.com/uploads/1/3/1/4/131453484/c772cc4986af.pdf
    • http://files.ptami.org/uploads/1/3/1/4/131437832/tatalujotepef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/101_benefits_of_black_seed_oil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/giwuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/kojenipidatole.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/vujiruje.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/dotuxebovorubigekima.pdf
    • https://cdn.shopify.com/s/files/1/0446/4944/7587/files/alteryx_designer.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/zobewaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5595/3558/files/additional_mathematics_pure_and_applied_jf_talbert_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0480/3746/files/zigixuvagajajesewedigabi.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_off00005de4.bin
cbd4840b4feca037e0bb51e182fe2176fd0d2c1b170b7cd0c23b8402adf7527c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE4 4716 bytes
font_01_sfnt_off00006dd9.bin
312156173f8f1d24751e79091679b2a13b0a1044a708b76fbd31478871af9c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 9104 bytes
font_02_sfnt_off00008d06.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 4324 bytes

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