Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f185975b160dce1…

MALICIOUS

PDF

42.7 KB Created: 2020-10-02 00:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 38980e331dd3d0fefcb5bcf0c4a53984 SHA-1: f58d867c86d26dfa1f0009532782900a5e666612 SHA-256: 6f185975b160dce120f343bf6e6fe19c2a04dde8e68923e27745a07439a3b52c
124 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body and embedded links suggest a lure to download APK files, likely leading to malware infection.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=punishes+live+apk+download In PDF document text
    • http://files.triparrvrentals.com/uploads/1/3/1/6/131637562/7a5089ff31ee.pdfIn PDF document text
    • http://files.david-arnebeck.com/uploads/1/3/1/4/131437295/62dd8be76e4f.pdfIn PDF document text
    • http://files.stannartsandculturalcenter.org/uploads/1/3/1/8/131871970/5b77075e9d7ad.pdfIn PDF document text
    • https://site-1036689.mozfiles.com/files/1036689/66061349252.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/zunogevuf.pdfIn PDF document text
    • https://site-1038836.mozfiles.com/files/1038836/nakuxumopob.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/54558814637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/meguki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3574/9271/files/action_movies_online_streaming.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/dead_trigger_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3223/5165/files/94511709556.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53D2 5168 bytes
SHA-256: 68bedb1682e2ba8e62fc5635a6546b4c865c3aea666ff03510e9f5e03b63ab2e
font_01_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 10420 bytes
SHA-256: d0ffd526805f8e6671c99b4757f7c2dc35f62484e6c24720543a79338447d94d
font_02_sfnt_off00008962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8962 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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