Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4249e606b788a21…

MALICIOUS

PDF

40.0 KB Created: 2020-07-09 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a5ff2c5d4f39d68e4cd89c3b68138f64 SHA-1: b5bcad245e678ca60baca08aebe1fbf964b27c46 SHA-256: d4249e606b788a21d08c3e36351c23c7e06f1eb3dd637ce7b605601782bce885
184 Risk Score

Malware Insights

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

The PDF file contains numerous links, masquerading as educational content, that point to a malicious redirector and a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to direct users to harmful sites. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

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/wb?keyword=printable%20math%20worksheets-%20decimal%20multiplication In PDF document text
    • http://files.observationsandconclusions.com/uploads/1/3/0/7/130738708/3033311.pdfIn PDF document text
    • http://files.windshieldrepairwoodbridgenj.com/uploads/1/3/0/7/130776481/8501425.pdfIn PDF document text
    • http://files.axpcbd.com/uploads/1/3/1/4/131437253/tapesixituraz.pdfIn PDF document text
    • http://files.bookcellarlwonline.com/uploads/1/3/1/8/131860787/xejapami.pdfIn PDF document text
    • http://files.cliveyou.com/uploads/1/3/1/8/131856331/tegutolej.pdfIn PDF document text
    • http://files.peterarmstrong225.net/uploads/1/3/2/8/132815342/dae4c49fd7.pdfIn PDF document text
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdfIn PDF document text
    • http://files.capecommunityorchestra.org/uploads/1/3/1/4/131437454/0d6524e208ea9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rebepotare.files.wordpress.com/2020/07/narugufemi.pdfIn PDF document text
    • https://zonivip.files.wordpress.com/2020/06/namojebefe.pdfIn PDF document text
    • https://xerekewavuzi.files.wordpress.com/2020/06/sukobetim.pdfIn PDF document text
    • https://marupuk.files.wordpress.com/2020/06/70105130944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 5524 bytes
SHA-256: 82e1ae121898f8de10bbfd10a992707ba9d4222a4d9778a2b183dce252e2daec
font_01_sfnt_off000071bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 9764 bytes
SHA-256: 093fa63db381d1dcd6250bf15023b21f9a403735f2470935f4f45a4f13e561bf

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