Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2e12ce677bb147…

MALICIOUS

PDF

79.7 KB Created: 2021-01-16 20:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a38ba6560c4de7cd2a001b111ab3a082 SHA-1: c3235a3c85d4c61a5151d73c0fc93ff5b754cef4 SHA-256: af2e12ce677bb14735f6a03e18ea77fc124465e68bb6fc72e434139f2336c5b0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. Heuristics indicate this is a link farm, likely intended to drive traffic to malicious sites or for SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=kizi+life+is+fun+slither.io In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_5fabddf2def52.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/tutoxodemufewo.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/2479.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/witejujub_debodozibo_jepidujiz.pdfIn PDF document text
    • https://site-1199244.mozfiles.com/files/1199244/boy_riding_bike_on_highway.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5ff5656382b82.pdfIn PDF document text
    • https://kepemumud.weebly.com/uploads/1/3/1/4/131454984/nemivizebimobu_wabagirijojo_loxamu_suvemuxuwatonek.pdfIn PDF document text
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/c3ed157b3ebe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5f8ff3cb60b21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/venepelutuduv.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/68167274985.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/18676281708.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_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 4696 bytes
SHA-256: 10257aab4b3509b9a87dc607d4a3054714f2373767a6321178f3f0783afc9240
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 14404 bytes
SHA-256: e1a25a9de7d778ee70ca8b6ccf17bcf68247ace1d8d90a89168027deab27c60a

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