Malicious PDF — malware analysis report

Static analysis result for SHA-256 857d1b795c73de80…

MALICIOUS

PDF

38.9 KB Created: 2020-08-26 02:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5dd277aefd007181f183e8af3270f918 SHA-1: e4634360ea875723c725de5024d4c9b89a90129e SHA-256: 857d1b795c73de808e8a8fd132718f0556cbcc59d9e9f057df366437979a6c2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially corrupted, suggests a lure related to downloading private videos. The presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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.link/pify?keyword=how+to+download+a+private+video+off In PDF document text
    • http://jufikefa.museautoproject.com/uploads/1/3/1/6/131606027/zisezazog.pdfIn PDF document text
    • http://files.marissafarrow.com/uploads/1/3/1/3/131379639/c7d648975be.pdfIn PDF document text
    • http://files.codi-us.org/uploads/1/3/0/9/130969494/mozisemed.pdfIn PDF document text
    • http://files.jmn-i.com/uploads/1/3/0/8/130814642/badegumun-vafadivo.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/1/0440/6919/1832/files/file_to_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9258/1288/files/chakravyuh_2012_movie_480p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/54453432973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/chemistry_form_4_salt_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/90108578061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8000/8359/files/ag_hvx200_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/64364295279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/nulujogefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/jurufesapodon.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_off00005b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B14 4972 bytes
SHA-256: 23a1e708089f2635e113c6badcf08b1b1d369feb80df2f8713648cfd529f3b4d
font_01_sfnt_off00006c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C24 10088 bytes
SHA-256: c923cba9fdc372250aff8b5e858212b58ed86cdb296d77c456bce71de542c5cd

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