Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bbb2c8248e4eb0…

MALICIOUS

PDF

42.8 KB Created: 2020-10-08 12:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f13ec070d9ba454095c9a52b044fb1f2 SHA-1: 715b2192e9ba2d02cb03881254659f07ab51924c SHA-256: b4bbb2c8248e4eb066d9fd943918396a672beeb21d99c818506bae5df18089d8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the string 'Unblocked minecraft mods' and a URL that aligns with the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click a link that likely leads to further compromise.

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://cctraff.ru/pify?keyword=unblocked+minecraft+mods In PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/32126722834.pdfIn PDF document text
    • https://site-1039787.mozfiles.com/files/1039787/dejamexoduxibijoke.pdfIn PDF document text
    • https://site-1044312.mozfiles.com/files/1044312/90287949165.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/vifagumi.pdfIn PDF document text
    • https://site-1043691.mozfiles.com/files/1043691/65651180661.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/97154530483.pdfIn PDF document text
    • https://site-1040892.mozfiles.com/files/1040892/bodozizebivuj.pdfIn PDF document text
    • https://site-1038555.mozfiles.com/files/1038555/16609479106.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/diwid.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/34955709795.pdfIn PDF document text
    • http://files.nmdecolores.com/uploads/1/3/1/4/131438316/winigewusosevu.pdfIn PDF document text
    • http://files.bumpbabyandbeyond.ca/uploads/1/3/0/7/130775337/pavidezurumukip_fagejejofopul_gelimawe_girina.pdfIn PDF document text
    • http://files.southlandfamilyclub.com/uploads/1/3/1/3/131379371/e862cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/nivemedajogimibilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2102/0578/files/vasexuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/85745420198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7617/7051/files/chill_factor_line_dance_steps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1928/6174/files/79474864975.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D4 5364 bytes
SHA-256: ff6929fb07f4f121ad14c23d31defc32cafb78cdc93c84095bfe9539fd1abe00
font_01_sfnt_off000079fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 10600 bytes
SHA-256: 6546cf5207d6f3493afe24d6465f9bdb173718f7f73aad4657bde0791d9118f4

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