Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f39b46ec0120cde…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 03:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ddebca2142fb90c0b07ff1212302ba5 SHA-1: a35b6d675cdc26d681268c198b2435105c7db90d SHA-256: 7f39b46ec0120cde3330b93d221a3516ac17fde1b7456f458e305101309147ee
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector URL, indicating an attempt to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, and the presence of numerous links suggests a campaign to distribute malicious content or phish for information.

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/wix?keyword=pilot+aptitude+test+practice+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a4828b92555b41358da5203a94787f42.pdf
    • https://static.usrfiles.com/ugd/cac9e4_ebe106d33627497897de5a030490facc.pdf
    • https://static.usrfiles.com/ugd/b8c837_490aa790dd5a4d7a8d9506a8d4864a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e80f3863e9394ff49499568e03ae0785.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d6d05ba13cc4be48b865d1ca7e988b5.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/58476340959.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/dinasadoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/2557983088.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/miliwol.pdf
    • https://static.usrfiles.com/ugd/43d598_eb68226b36d643069a9756d2d8d057d6.pdf
    • https://static.usrfiles.com/ugd/fa6f14_dc826e7c31f34adb9198d17315c336f2.pdf
    • https://static.usrfiles.com/ugd/50c35f_64f8d2430aae480d9f2b1ece2d8d5637.pdf
    • https://static.usrfiles.com/ugd/a86d68_deb38400eba04ec3ad635f7940372af9.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/pixajelaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/wukewaxifowixi.pdf
    • https://cdn.shopify.com/s/files/1/0463/9693/2251/files/kamepunavefukularogafigex.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/flex_box_froggy.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_off0000753c.bin
85f7d0e1f1cca9694003dba0dbee1909c971ef97ca9fe09e3d3798d98c61a4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 5152 bytes
font_01_sfnt_off000086c6.bin
71106ea0803d5208d0011079631fd4e28b9fb4e0498cac2e74a0f412afb83837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 10544 bytes

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