Malicious PDF — malware analysis report

Static analysis result for SHA-256 1671a6ccd1b7c720…

MALICIOUS

PDF

113.4 KB Created: 2021-01-23 12:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 812f054ceab1847dba4d799293e118c9 SHA-1: c14604f1a27c44019af4bfc285de4c8ad464df4b SHA-256: 1671a6ccd1b7c720db3221ddf84f5039afc9df53d9435e70e7025e704d8589db
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'unlock time' and 'little alchemy 2', likely to trick users into clicking the malicious links. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=unlock+time+little+alchemy+2 In PDF document text
    • https://site-1258450.mozfiles.com/files/1258450/telugu_love_feeling_video_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/1jbUiim/59571257438.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/new_berserk_news.pdfIn PDF document text
    • https://site-1192273.mozfiles.com/files/1192273/ten_pin_bowling_balls_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_600978a447cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/bzCiadF/73479023261.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/x8Mjbjh/hot_100_radio_station_spencer_iowa.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/9hhEtge/video_bahamas_airport.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6000f8ac950c8.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/wegizulol.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/rubufovuguw.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jdjeJhe/kuvejosalumibamegotolun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd7ade953488.pdfIn PDF document text
    • https://cdn.sqhk.co/biwufudi/CkjbjSb/pikapedefajolidowoza.pdfIn PDF document text
    • https://site-1168034.mozfiles.com/files/1168034/voponupaperafuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 4844 bytes
SHA-256: 4251d36622e9d087c548b8a4449adf1fac8841a23c341b9e6b200e11012b282c
font_01_sfnt_off00018718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18718 10180 bytes
SHA-256: 2d78a201a44d28f4a6bd9925a50c6e47ada38eae85d0c5f151d7d817721acd99
font_02_sfnt_off0001a9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9BE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.