Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af9fceab83aeaf6…

MALICIOUS

PDF

44.4 KB Created: 2020-10-09 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d34baeabde4646b6e7f4d2019484743c SHA-1: d20d0d8eccfaee11377631d055bd7f40a7beb38b SHA-256: 1af9fceab83aeaf63d18e8365d2726a70a5b822567bdca51f34c4774d700cc1f
184 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to disposable hosting and redirector services. The presence of a link to 'cctraff.ru', identified as malicious redirector infrastructure, strongly suggests a malicious intent, likely for SEO spam or phishing campaigns. No scripts were extracted, but the structure and embedded URLs indicate a malicious redirection pattern.

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.
  • 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://cctraff.ru/pify?keyword=lily+espresso+cups In PDF document text
    • http://files.wandapayne.com/uploads/1/3/0/8/130873849/rumexefakoji-gefirabebitan-xasot.pdfIn PDF document text
    • http://files.mbrambilla.com/uploads/1/3/0/7/130775982/856268.pdfIn PDF document text
    • http://files.carneyrounduprodeo.org/uploads/1/3/1/4/131406273/6d3e4.pdfIn PDF document text
    • http://kamifapa.colinleevesview.com/uploads/1/3/0/8/130813547/lezobigazosalufime.pdfIn PDF document text
    • http://kojexem.chasingbears.com.au/uploads/1/3/2/7/132740480/sidezixok.pdfIn PDF document text
    • http://files.gotoplanetarium.com/uploads/1/3/2/7/132740375/f9c70.pdfIn PDF document text
    • http://files.reddevilphotographic.com/uploads/1/3/1/0/131070294/1499280.pdfIn PDF document text
    • http://files.supportladd.org/uploads/1/3/2/8/132814031/sawidum.pdfIn PDF document text
    • http://files.brannanblascak.com/uploads/1/3/0/7/130739918/5761022.pdfIn PDF document text
    • http://files.ronanboudier.com/uploads/1/3/2/8/132814277/sokifaxolatuka_jeniwowirafum_wepokanux.pdfIn PDF document text
    • http://files.demolitionstudio.com/uploads/1/3/1/3/131380969/xilabefewimikorusefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadce5eb-c4c7-46ae-b230-fe41ff5292e6/59044632102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea895f6-3b62-4e75-97bd-7628ea029044/7179899319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b27c85-e233-4d59-aeee-147a33543fdf/26722276158.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 4760 bytes
SHA-256: c1fd336deea7bec57776d3f5f122286fe7f936b6171ab8fde55f7ee4fb38aa80
font_01_sfnt_off00008077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 10896 bytes
SHA-256: 68e92e75e9be3ebe58566a513c3e43d665e9d05fd3fe96e961d83281741a0557

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