Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b71aeabf3679115…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 21:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3eac1b760dfe604e427d53932b4998 SHA-1: bb45ebd2cac9723037299a0b0f55f76f809f92e9 SHA-256: 7b71aeabf3679115f942a184ba69e24d4e8689cf26ac8c22a8b49bda54413416
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting an attempt to direct users to malicious content. The ML classifier strongly indicates 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.cc/pify?keyword=reporting+binomial+test+apa
    • http://files.kil-n-it.com/uploads/1/3/2/8/132815318/1950599.pdf
    • http://totadoxew.authorrobertmuir.com/uploads/1/3/1/3/131382486/6729201.pdf
    • http://files.blessedimp.org/uploads/1/3/0/9/130968996/wimosife-bazotakexijixa-dedesanamop.pdf
    • http://votikagup.kisdesigns.net/uploads/1/3/0/8/130873890/jujubaxa-nejonuta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/2620673868.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5644/files/oh_ho_bandeya_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/tutorial_dreamweaver_cs6_lengkap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/xirawedupekizodij.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/11189188904.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/bsc_nursing_admission_form_2019_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/28501888824.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/keto_plan.pdf
    • https://cdn.shopify.com/s/files/1/0443/8438/7238/files/80601858055.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/78586034892.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_off00006837.bin
3a64242b0f9e9cf86149043fdb0133385041e5a98eaa0c30126f57a5929e727e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 5288 bytes
font_01_sfnt_off00007a1b.bin
70c1133c9c31cbd764e2cb78c03313dba0ac9283667cfd7b5e69a20d4c53e4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 10084 bytes