Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f570afb8617bec…

MALICIOUS

PDF

38.1 KB Created: 2020-08-13 13:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c6c740b03c0392cc1317443679a851a SHA-1: 3381d85e6f86ec45374117a250b5d9ce4d8e24ce SHA-256: 81f570afb8617bec7298950413886cee4b3e7ab9f8457df72222f418ffc9862c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to increase visibility and potential clicks.

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.ru/wb?keyword=journey%20don
    • http://files.kingofpopz.com/uploads/1/3/0/7/130740178/c67ceb.pdf
    • http://mewaxe.ourlittlebitranch.com/uploads/1/3/1/3/131398404/2871649.pdf
    • http://files.cherylvanase.com/uploads/1/3/1/8/131871614/wuperivegol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/kevusepexemosulebanovob.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/cage_aux_sports_menu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/23543060074.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/puvuxederelukorun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/kondisi_perekonomian_indonesia_saat_ini_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/kaba_locks_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8024/3617/files/retinografia_glaucoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/adobe_illustrator_crack.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/gefemojebirololabe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/bsc_3rd_year_chemistry_notes_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/bitop.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_off000055aa.bin
63272f8972836ce9925c01ea4caac3c878b0fd3f0bdb33aa767ff36190a05e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AA 5360 bytes
font_01_sfnt_off00006800.bin
02362dcd2fae61c495bb8624f3f7429dbba367b74d830b55cc54ad55df1ee372
pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 10364 bytes