Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be2000403639b2e…

MALICIOUS

PDF

42.9 KB Created: 2020-10-11 05:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 313f0bee69838078a7802092b158f78e SHA-1: 19dafa5ced20773c893fec77c20d5e7567e31ea0 SHA-256: 0be2000403639b2eef970b3060643b79977f55edb4fdbdc784857450b42b4a4f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document acts as a link farm, presenting a deceptive prompt for a "proof of no income letter download" to entice users to click on malicious URLs. The primary URL, https://ttraff.link/pify?keyword=proof+of+no+income+letter+download, redirects to a network of disposable domains hosting further PDF files, indicating a phishing or scam campaign. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior.

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.link/pify?keyword=proof+of+no+income+letter+download In PDF document text
    • http://ponof.alisonchiamartworkshopsjervisbay.com/uploads/1/3/1/4/131483371/lurasojela-difusunope.pdfIn PDF document text
    • http://files.rockcandynp.com/uploads/1/3/1/4/131406519/felibofu-pofufimelupirep-zutadozixete-kerefotalasin.pdfIn PDF document text
    • http://files.beadart-austria.com/uploads/1/3/1/1/131164081/solax-jeruvipaze-vifuwaxa-zifinaxuso.pdfIn PDF document text
    • http://files.nazarenemissions.ca/uploads/1/3/1/4/131437093/ccf926.pdfIn PDF document text
    • http://files.bikiniusa.com/uploads/1/3/0/9/130968956/0c45787b4eb.pdfIn PDF document text
    • http://luwut.emsworthstandrews.com/uploads/1/3/1/8/131857419/firagumizibewu.pdfIn PDF document text
    • http://masuxa.artdistrictgallery.org/uploads/1/3/0/7/130775958/2606367.pdfIn PDF document text
    • http://files.lianajoychristensen.com/uploads/1/3/0/7/130775429/gewebozof_febokonajoz_zezisap_revelimer.pdfIn PDF document text
    • http://files.cfpcf.org/uploads/1/3/1/3/131383748/ratugegikatuwoj.pdfIn PDF document text
    • http://fevirapu.forestlakescounseling.com/uploads/1/3/2/6/132681233/50018.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://uploads.strikinglycdn.com/files/70029d69-d1ce-4ed1-8bd2-9fc676bb1d7b/75478016888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df8313c-d8c1-4ece-9e44-deb7b0e2529d/sejazewimupapeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903a4559-db44-4bcb-842b-976a7e8e5616/juwur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 4872 bytes
SHA-256: 5a8ab61e89d287acacade076bd4908546838fae0e64df96e7039c0b84bc89612
font_01_sfnt_off0000708d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 9456 bytes
SHA-256: 27bb6754f70de566d94967ddf2739644a630a64feafe11b94144d27b724e9131
font_02_sfnt_off000090c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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