Malicious PDF — malware analysis report

Static analysis result for SHA-256 014a5e5b17fcd616…

MALICIOUS

PDF

66.1 KB Created: 2020-10-05 16:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 40ece1882be9f5a32f1ab5c8042add90 SHA-1: ec18a34bcc5bd1ac82d456fef781a3b03aecf881 SHA-256: 014a5e5b17fcd616bafbe529519999435f3163bc2e2c00af3a01d73242c70084
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure the user to a harmful site. No scripts were extracted, but the presence of multiple links points towards a link farm or phishing attempt.

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 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=only+miss+the+sun+when+it+starts+to+snow+girl+version In PDF document text
    • https://site-1039355.mozfiles.com/files/1039355/gatedokiwafukosoxodel.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/2658089097.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/66208035853.pdfIn PDF document text
    • https://site-1040136.mozfiles.com/files/1040136/zomanemuvisabalinapu.pdfIn PDF document text
    • https://site-1043882.mozfiles.com/files/1043882/tomilaveme.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/25704069470.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/xijoluwobarulemujaza.pdfIn PDF document text
    • https://site-1041779.mozfiles.com/files/1041779/51168206284.pdfIn PDF document text
    • https://site-1044071.mozfiles.com/files/1044071/savesulatobowu.pdfIn PDF document text
    • https://site-1036746.mozfiles.com/files/1036746/96746312531.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/59645384974.pdfIn PDF document text
    • https://site-1039201.mozfiles.com/files/1039201/12043986571.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/1/0483/5986/6521/files/76279044322.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_off00009777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9777 5260 bytes
SHA-256: 5a95a2d2d4bf807aae1973dba6886131577a484faac4a1906cef2f56f553d722
font_01_sfnt_off0000a944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA944 14780 bytes
SHA-256: 1393fac93c7b8a0d45165d62da476c85ef79cad0608e44a788fbcd795b4fb272
font_02_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_03_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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