Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cfba59ebee471f…

MALICIOUS

PDF

42.5 KB Created: 2020-10-07 07:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0d2159d47761377a736a139804b1b981 SHA-1: d69361938bb3cdb68d7c852346d06e4a05db6d23 SHA-256: a7cfba59ebee471f33100c712fe7ca30f4ecda5394fa6561afbe301f8f8cce91
224 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to distribute malicious content. The primary redirector URL is 'https://ttraff.link/pify?keyword=symbiotic+interactions+worksheet+answers', which likely leads to a phishing or malware download site. The document's content is minimal, suggesting its main purpose is to act as a lure to click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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=symbiotic+interactions+worksheet+answers In PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/wowafudekawipupotazus.pdfIn PDF document text
    • https://site-1039152.mozfiles.com/files/1039152/24936987236.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/dodejukupopagupe.pdfIn PDF document text
    • https://site-1037905.mozfiles.com/files/1037905/tuziwajewafalewosowanix.pdfIn PDF document text
    • http://files.cohdakwartet.com/uploads/1/3/2/7/132740458/dataviwop_fexugagumu_kupapoxut.pdfIn PDF document text
    • http://files.tulalipyouthservices.com/uploads/1/3/2/3/132303329/zipuxiwusa.pdfIn PDF document text
    • http://bavudu.milfordgardenersclub.co.uk/uploads/1/3/1/3/131398379/7400445.pdfIn PDF document text
    • http://gawatig.harrietcolestoryteller.com/uploads/1/3/2/6/132682704/3747638.pdfIn PDF document text
    • http://files.washingtonpedic.com/uploads/1/3/1/8/131871433/507746.pdfIn PDF document text
    • http://files.harborcabinets.com/uploads/1/3/0/7/130740183/nusarap.pdfIn PDF document text
    • http://files.californiaindigenouschintattooing.com/uploads/1/3/2/6/132696214/bodobewojunijolike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a77ae9-1a45-4196-baeb-f405b44adabd/xejeravefebufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88424199-341f-4543-9c11-f4861e31cce4/49822777897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a60abb8-0a04-4d77-ac62-bba88088eb07/suzexesebopegamubinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aa1d0e-6b9c-4754-b551-b05e977c30a3/88624912445.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_off000067a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5508 bytes
SHA-256: 8e7f7c71fb585fa2d8104181ba5504f19041d03d16c273efad6c9f0628cd9bad
font_01_sfnt_off00007a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4A 10108 bytes
SHA-256: 8cca2802d2d53cc7c6c2959fdfedd102dbb7fdc42f2e2cc2e571f72d6ccd9614

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