Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a5936ad81f717a…

MALICIOUS

PDF

31.5 KB Created: 2020-08-15 04:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 623c4f6bf2301b45c765a0a8f71ea6ce SHA-1: adaeca803136b3f901bb944a69b38cf60187f89d SHA-256: 76a5936ad81f717a38c674d30faa95437771c3bf6eb9700da9b5f4456ede03d3
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a redirector known for malicious activity, which is designed to trick users into downloading an 'Android keylogger apk'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to distribute malware. The document body and heuristics suggest a phishing or social engineering attack aimed at delivering a payload.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=android+keylogger+apk
    • http://files.acmdev.net/uploads/1/3/1/4/131438245/c930290ef648522.pdf
    • http://files.sydneyschiffdanceproject.com/uploads/1/3/0/7/130775337/2689919.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6408/0024/files/revazadetinidojuter.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/94716195490.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/ecological_systems_theory_social_work.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4183/files/arbitration_act_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/muzulidefiweromolomilejeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7628/files/jilugododofidibosarowaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/73041257332.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/ruribijibivuserit.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_off0000409a.bin
4db6dceece3c1a7e89615bdc441442307c52e1acdc186a0cbd453e18025dc0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x409A 5104 bytes
font_01_sfnt_off0000520e.bin
d45b82cb883e2656d9e38fb4673c6a8b3ff3d80a4315f32a16b267d12784f496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520E 9340 bytes

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