Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b14c22ec731284…

MALICIOUS

PDF

49.2 KB Created: 2020-11-06 18:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e73dcb2ae22d3f7493706b5d11c9e8d SHA-1: 26e6f77fc2c7029e70596bc48f37c311a7cd28b5 SHA-256: 31b14c22ec73128474ed1c6f5a1c8986765dbf717839558732696d64063d18ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm designed to direct users to potentially malicious content. This indicates an attempt to lead users to external, malicious sites, likely for further exploitation or phishing.

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://cctraff.ru/aws?keyword=ab+dekh+khuda+kya+karta+hai+ep+6
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5f9c06cd01762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://difuxotuw.files.wordpress.com/2020/11/86083007161.pdf
    • https://s3.amazonaws.com/pewibim/great_dragon_dubuque_ia.pdf
    • https://s3.amazonaws.com/jifesu/kinh_kinh_mung_lyrics.pdf
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdf
    • https://fivepapovite.files.wordpress.com/2020/11/jamaica_kincaid_girl.pdf
    • https://lidokofokaz.files.wordpress.com/2020/11/48665448125.pdf
    • https://s3.amazonaws.com/jewizopukuni/balow.pdf
    • https://navisemuzezo.files.wordpress.com/2020/11/82992784847.pdf
    • https://felibule.files.wordpress.com/2020/11/povenowitifebazoduvi.pdf
    • https://s3.amazonaws.com/wonoti/agneau_de_dieu_messe_de_la_trinit_partition.pdf
    • https://wanunukine.files.wordpress.com/2020/11/danganronpa_chapter_5_guide.pdf
    • https://uploads.strikinglycdn.com/files/409d7618-0a19-460e-9be8-06b4079ce2cd/7354113116.pdf
    • https://uploads.strikinglycdn.com/files/738e7d8e-475a-4883-b335-09f74b39f791/wupisedubejovovuxutubi.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000900f.bin
3937020a8f0fb4c15a8a071b6c6d2a5c3b018c5b31a66e3f50345e856881a988
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x900F 23208 bytes
font_00_sfnt_off00005a74.bin
2d39329a61c0248e69300d871768f354e532494e709046dcfa0048a2bfa79899
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 5284 bytes
font_01_sfnt_off00006c70.bin
65b1c752a808975f07296e519b52713ffb7c8d3e21eb2eb6537816bfc543e864
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C70 10396 bytes