Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da3a2c3faf97480…

MALICIOUS

PDF

46.8 KB Created: 2020-10-10 21:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 042f5e84ee9b98efaeb582db88f6b091 SHA-1: 5b6d3465ef8f7d9aa5f797ee26f37fee6f22ec0b SHA-256: 9da3a2c3faf97480c3bf18d14eb95f3e8506c122c5c0e662f49bad63f41bd4a5
224 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to link farms hosted on disposable infrastructure, suggesting a phishing or scam attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.link/pify?keyword=knight%2527s+sword+quest+guide+osrs', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to a 'Knight's sword quest guide', indicating a lure to entice clicks.

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=knight%2527s+sword+quest+guide+osrs In PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/65147982472.pdfIn PDF document text
    • https://site-1042348.mozfiles.com/files/1042348/49872870321.pdfIn PDF document text
    • https://site-1036693.mozfiles.com/files/1036693/86177786201.pdfIn PDF document text
    • https://site-1037893.mozfiles.com/files/1037893/vobarenojowidebotivag.pdfIn PDF document text
    • http://files.millionaireoutlook.com/uploads/1/3/0/8/130814611/vuboximikenux.pdfIn PDF document text
    • http://files.crossroadsbiblecollegeandseminary.com/uploads/1/3/0/7/130740148/1cf2556da50.pdfIn PDF document text
    • http://fexub.theflashbacksmusic.com/uploads/1/3/0/7/130739416/wuwiji.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/1/0481/3337/4119/files/solstice_and_equinox_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1260/4582/files/canon_vixia_hf_r80_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0636/4318/files/iglesia_de_efeso_en_la_actualidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a600f7-5ba3-4858-bd81-5a3f246dc847/38968613383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a53e03-f17f-43b8-b420-79ba4d0ee08e/35734525179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f7e271-8dd2-4cc6-8cd7-905e3e1b21e7/deleredinakowodibubix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1b3695-f0ad-4434-828f-8520e81c60d4/polepulakane.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB3 4948 bytes
SHA-256: 0253cf371ca724de0f09ea7c97a1eaedc45ec727c5131380e1c9e553db03cbf3
font_01_sfnt_off00007d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8E 10004 bytes
SHA-256: b07c89e0ee91bfbcc53d47a9b3b73956ff095bbaf1fe809bf5ec60e46e181f7e
font_02_sfnt_off00009fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176