Malicious PDF — malware analysis report

Static analysis result for SHA-256 81812a2a9af03d79…

MALICIOUS

PDF

42.4 KB Created: 2020-09-17 00:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9785993ecf4f66179b0b741fb455d5f SHA-1: 5c1ad85bd0309f0fa559ef095e6707a339006d1f SHA-256: 81812a2a9af03d797c1b86c1b4c51b5288029255edd1792a5f16a597e235aaa8
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at `https://ttraff.club/wix?keyword=how+do+you+linearize+an+inverse+graph`. This suggests a phishing or scam attempt designed to lead users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=how+do+you+linearize+an+inverse+graph
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/retron_5_reset_button.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/video_converter_to_mp4_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/cambridge_english_in_mind_workbook_4_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/suvaseximiwodasafagegoxim.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/rivuzepelivasitini.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/15867728437.pdf
    • https://0ab20def-f588-4b60-9c28-43f3d6cb62ac.filesusr.com/ugd/031dda_5d26355ee3354170aac62bc352b875f0.pdf?index=true
    • https://e36967bd-835d-49fc-9fe0-a9a20fb64cfe.filesusr.com/ugd/fe83c3_2ea7590d666446a3b57e798269bbde75.pdf?index=true
    • https://293f0243-eb43-40e8-a6bf-7288d9b6a828.filesusr.com/ugd/e3ed1f_88f2df2d18e4400b81a003cb84f71418.pdf?index=true
    • https://b62e4fa8-ca95-4eb2-8dab-207c7cc807a8.filesusr.com/ugd/008e52_c03530a630b74b14a9f30e22669d00c8.pdf?index=true
    • https://18bd0c66-2813-4841-9c71-ad1cd933c6bb.filesusr.com/ugd/113e89_56aab9ea4ae4474286a83ccae197a22a.pdf?index=true
    • https://50f13ab2-b15c-4a6e-b51b-b01a23a755e0.filesusr.com/ugd/5bf82b_2237651c4a73417dab3cf8307402f16c.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_off0000669d.bin
91f9cbfe24aee258166a408213ead9e300eb1534dcc9b7154066b7be8e27ff2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5488 bytes
font_01_sfnt_off00007965.bin
cfbca69490c6d7f1616f0c1c152fbb78be5a853a7f6008b4da93005039435911
pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 10428 bytes