Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ac38661995dda7…

MALICIOUS

PDF

39.6 KB Created: 2020-10-06 12:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ad1f161954c6b7cb79ece73b77839bc SHA-1: 34a280f3ebd03f72cbab10241664e8036453ab7e SHA-256: d2ac38661995dda7e740e5da2950b535f37bac9624bab532a2711c812ae0d3f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirect to a known malicious domain. This indicates a link farm designed to lure users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=specification+of+activated+carbon+for+water+treatment In PDF document text
    • https://site-1039896.mozfiles.com/files/1039896/37001777844.pdfIn PDF document text
    • https://site-1043124.mozfiles.com/files/1043124/48189010920.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/18547271837.pdfIn PDF document text
    • http://bobepi.lakeeriecommunications.org/uploads/1/3/1/4/131437601/6858353.pdfIn PDF document text
    • http://files.photosbymelissakizis.com/uploads/1/3/0/8/130874501/f5718e9d9f5c5fa.pdfIn PDF document text
    • http://files.toymigos.com/uploads/1/3/1/8/131856381/61b8c1a.pdfIn PDF document text
    • http://kifuta.goodshepherdbeaverton.org/uploads/1/3/1/4/131437462/xegudewinugiwoko.pdfIn PDF document text
    • http://files.airbrushingglass.com/uploads/1/3/2/6/132681579/7c49ac07861a2e.pdfIn PDF document text
    • http://files.griffinace.com/uploads/1/3/0/8/130813645/6447612.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/1/0430/6652/3809/files/into_the_dead_mod_apk_everything_unlocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9533/7376/files/us_history_final_exam_review_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5646/3015/files/63902059592.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_off00005d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0A 5488 bytes
SHA-256: dfb412522b8d43b525cf44552822f7f63e8dc95846f67302d465540186b4df53
font_01_sfnt_off00006fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 9880 bytes
SHA-256: 7f9209fd8ec8f705ab616a0209bf62c868fc4b914791da5669fee2c0da42aaf8

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