Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ff04d004559e48…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 08:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08a62c3686a1536b955e5cfedf4a8c3 SHA-1: ca18b00f764fe0d6508cab2457758cf085c7150e SHA-256: 62ff04d004559e48744ddbce7e79ba4d84654c82069c7a6e40bc5e5e7414c0d7
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an academic resource. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger scheme to generate traffic through numerous links, many of which point to benign Shopify domains but are likely used to obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent.

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://ttraff.ru/pify?keyword=ignou+assignment+2018-+19+solved+pdf
    • http://files.myclipartcafe.com/uploads/1/3/0/7/130739646/jubuzanojavan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/the_walking_dead_full_episodes_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/bijuzojinaxuso.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/86489092925.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/celestamine_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/funny_jokes_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/xizenisuvanija.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/10438767025.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/gebixozalutuzewelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2391/6443/files/affairscloud_monthly_gk.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/enescu_cantabile_et_presto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060bd.bin
25f77220cf9e9b78b471742638804174a6b75b1cc2ea877af3a318678e972f57
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BD 5968 bytes
font_01_sfnt_off0000751b.bin
8c946951c59af85dd1bc76fc21994374e3b87522b88b094a2bcaad97236d16cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x751B 10456 bytes