Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71458c289befc8c…

MALICIOUS

PDF

47.5 KB Created: 2020-07-28 00:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb6e23fe4c941552ad69eb75609a361 SHA-1: 20b4df83038a6d39b337233b3be34a11c6c20967 SHA-256: b71458c289befc8cae82a5ef18a5554fe6f64ba5171d6f5f115251f49a999b61
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for software updates. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates the intent to redirect users to malicious sites, likely for malware delivery or phishing.

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=net+framework+3.+5+win+8.+1
    • http://files.hamptonshousewife.com/uploads/1/3/0/8/130814110/berebenirasuwo.pdf
    • http://files.floorsofdistinctionltd.com/uploads/1/3/1/4/131407530/132827.pdf
    • http://files.anexclub.org/uploads/1/3/0/8/130874043/2cce4.pdf
    • http://files.joycelynnhewitt.com/uploads/1/3/0/9/130969192/5520814.pdf
    • http://files.kallistitours.com/uploads/1/3/1/1/131164552/fufefimozukawar_moxugeje.pdf
    • http://files.kallistitours.com/upl
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/2870577842.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/48660826758.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/4937071425.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/pemaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/faxulik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8609/files/85895108563.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/dotatu.pdf
    • https://cdn.shopify.com/s/files/1/0441/2545/4488/files/mepuwitep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/letigete.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/fugabitavixovogi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/53446797791.pdf
    • https://cdn.shopify.com/s/files/1/0434/2605/4306/files/3189296436.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007223.bin
b8e737c0a12e271c43a65a0322aa5648becc24306b28fbeec00c5c9d4d5be009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7223 5180 bytes
font_01_sfnt_off000083cf.bin
7222db2cb6df9b5d49a52bb61107ebae4bb488e2343b011fa4c60bd7b8411750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CF 16076 bytes

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