Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a042fd5f0b27a0…

MALICIOUS

PDF

54.7 KB Created: 2020-11-01 05:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 57cd5f34d82c9faac23fc6c692a7d3d4 SHA-1: d5913a3f0b238be5bdccf46a1c64e77836d8ab24 SHA-256: 40a042fd5f0b27a08808c6f8f41c8eeda29b78a3f4701a3f4fbdecd2180693e1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=angle+of+elevation+and+depression+word+problems+worksheet+pdf In PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/jefokedilupum.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/1286989.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/24d651a7fd17e6.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/namitubi.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/1550952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5f9ce7a17dfbf.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/jesozobazasimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5f9dffef3e167.pdfIn PDF document text
    • https://sositero.weebly.com/uploads/1/3/4/3/134389363/kejejiziteleba-radijad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0508/0658/7577/files/jaxavamiv.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/nephrogenic_ascites.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/72401450492.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/visual_protein_synthesis_worksheet_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C3 5588 bytes
SHA-256: b9212d5e85ab3f0e184ff3eb09d3bdc98a3a95685c6c7d7923e1258b05876d02
font_01_sfnt_off000083a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 11176 bytes
SHA-256: 679cded721cf2837b00ed1f7f62498824c1004b235288862d0d4cc04de7c2eeb
font_02_sfnt_off0000a9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D4 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1
font_03_sfnt_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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