Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7722c800970a175…

MALICIOUS

PDF

44.8 KB Created: 2020-10-29 19:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 881699a655007a51e4149ff484c3b50f SHA-1: 9c5d31f7eaccb51de77f7d6fd1881630782aef6d SHA-256: a7722c800970a175f9f7aedf0154a9e654c0ecc36f1bfa282c864df098a34624
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. 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://ttraff.com/123?keyword=the+mask+cher%2527s+child In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f99e8aee17d2.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/1932530.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/6627696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f888f9394691.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/2453570.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/pevoxuligax.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/saduburusox.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/81f80e371040dae.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/247b1b8b5d9b4.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/5f63a4c0-0319-48f7-9791-7721d3190127/gikevuboburuba.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/partition_piano_amelie_poulain_comptine_d_un_autre_t.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/introduce_yourself_in_english_interview.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2170/2596/files/wuxavifotanukolupifakadel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9939/6531/files/tineniloloz.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_off000070fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70FB 5228 bytes
SHA-256: 67230e061740fd90bf8f2b1956c8fd0c26559b6207369edd693d2540d476e419
font_01_sfnt_off00008295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8295 11000 bytes
SHA-256: eab8bcc3c1101d373320e1cf9850e2d288eb8fa810fdb7115f318de0d933e461

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