Malicious PDF — malware analysis report

Static analysis result for SHA-256 5612be9b2a157c45…

MALICIOUS

PDF

57.9 KB Created: 2020-11-01 07:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 56ce549571b880ca261b7d5099a777b4 SHA-1: d3bca96058714a26164532db08324a2a177713e7 SHA-256: 5612be9b2a157c45d06c6a9e530b589fb6c4f4931f3aab2c95953cbcbafe58e3
154 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, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://cctraff.ru/aws?keyword=ciara+like+a+boy+release+date', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=ciara+like+a+boy+release+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8f64eb4ef3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_5f97c4f899e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f9de68b6eaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_5f949668720fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5f97b0533c5f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f9c579eb95f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5f90f7cdf2116.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/dobexuguwevaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9366/0326/files/28999238725.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/philip_larkin_aubade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7166/0189/files/krop_senior_high_school_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3994/6433/files/kein_ort_ohne_dich_ganzer_film.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4865/4752/files/ncis_los_angeles_season_12_episode_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0994/9863/files/59959432711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3129/3863/files/zenui_launcher_5.1_apk.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008a30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8A30 15076 bytes
SHA-256: dfa6f5c206e57ebe6414023c8fbf846f70e4d984cc42cb88f5fbba2f6c6643b3
font_00_sfnt_off00007913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 5028 bytes
SHA-256: 279a6f4fe7cb20c47ed07702fcd998002ceca2cb4fe11eba98514d5ff1a56292
font_02_sfnt_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 11332 bytes
SHA-256: 90039495797ff8e130d41a23a3c9b706c872f27ed7e19303acd2c63fb80e1ab3

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