Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5939e0f4e29cbc…

MALICIOUS

PDF

51.8 KB Created: 2020-09-19 01:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3bdd3417d34526900397c4df0f946a7 SHA-1: d210a223e7385da47d3fe7dbd5dd4e8a357209a8 SHA-256: 5c5939e0f4e29cbcf069d690ec7b6dd46bcc7c3233d86700883364595df9477a
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of a 'download button' lure and a large number of embedded links further suggests a malicious intent to direct users to harmful content. No scripts were extracted, but the primary malicious indicator is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=mmd+r18+tutorial
    • http://files.fyldecoastrunners.com/uploads/1/3/1/4/131438604/5ac7903.pdf
    • http://nikirujo.pnanorthhouston.org/uploads/1/3/1/6/131637814/jefekup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://877e76f9-7742-44e2-97e3-5b7f4ffb93c2.filesusr.com/ugd/eb4c03_12ec62141e4043d5a67b9263bfea3ac0.pdf?index=true
    • https://9b08dcf1-d47f-4fba-a77d-12f02720e9ad.filesusr.com/ugd/ace02d_25a89ca630ec4f13b6d7d5753cd41f7c.pdf?index=true
    • https://dbf5d4c7-48ed-4191-b0a1-faae4be1950f.filesusr.com/ugd/5bf82b_d313333139c04fbe80d23772cdf18885.pdf?index=true
    • https://b2a80ab4-e4c0-45ad-93cd-c1ad51bd66d9.filesusr.com/ugd/c1c462_fad8ae115254417193fbbe2e1c5221d5.pdf?index=true
    • https://fd29c01a-a183-4061-bd93-24492603cae6.filesusr.com/ugd/b98abb_36ea6eafc06f4e5db28f686014acd0a5.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/1239204219.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/79145766763.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/beginner_vocabulary_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nawujumukupuzuwoxelojoses.pdf
    • https://e3151a9c-eea6-4cf9-81dd-6126fb0eab41.filesusr.com/ugd/3d0627_a9aa15ba630249708d1b8fa06b2ae270.pdf?index=true
    • https://bb598690-a26a-43cc-84a5-1c353d2fac96.filesusr.com/ugd/b7306e_57063fb86d5a44b6812584b83c8d39f0.pdf?index=true
    • 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_off00008d7c.bin
8e91da328d9c36203c33daae2bece7706d88002a6f97f141af38873ac0d8af7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7C 5044 bytes
font_01_sfnt_off00009e95.bin
b41732c6a67d9a04ef4f4c19d0eb6a61ed94e0ad190d27a383741664d5dd9d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E95 10560 bytes

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