Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a453453c0f8cf2…

MALICIOUS

PDF

44.1 KB Created: 2020-10-10 19:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5121c6425507e16d50550536ffe944c7 SHA-1: 6578472b3def7f7552750eee712883f93859fced SHA-256: 04a453453c0f8cf2ab997c2a0751253a7a7ccc1f372a7579fdb1529463eed423
184 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to redirector infrastructure and disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites. The document body, though partially obfuscated, contains the target URL which is a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=king+air+c90+flight+manual+pdf In PDF document text
    • https://site-1040798.mozfiles.com/files/1040798/9190491317.pdfIn PDF document text
    • https://site-1040386.mozfiles.com/files/1040386/19706186576.pdfIn PDF document text
    • https://site-1040131.mozfiles.com/files/1040131/fosovulozanaz.pdfIn PDF document text
    • https://site-1038438.mozfiles.com/files/1038438/veritoniwuxasizaxiw.pdfIn PDF document text
    • https://site-1038699.mozfiles.com/files/1038699/gamivofuze.pdfIn PDF document text
    • https://site-1043120.mozfiles.com/files/1043120/28405061500.pdfIn PDF document text
    • https://site-1039183.mozfiles.com/files/1039183/fekiforulotesulu.pdfIn PDF document text
    • https://site-1038575.mozfiles.com/files/1038575/40221809253.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/46077372421.pdfIn PDF document text
    • https://site-1040878.mozfiles.com/files/1040878/60921091143.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/1/0484/7642/2306/files/why_wont_you_answer_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936e235f-64c3-44b6-ac83-b8e942891c85/xotuwusuwiruni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ed330c-2c32-4f84-8cea-beaf0c393df2/77797356169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c280be4-f8b9-4051-bd60-bcada4f7d324/kuparirewaxamagipeviboxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fbb1d8-7a47-43f9-a629-36bd08d86dc6/34016559424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fc3173-4c45-4409-874d-1a073a9460a2/33646311874.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_off0000533d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x533D 5312 bytes
SHA-256: f993f0774011c3bbf2a8b5644e2d553e3117b715017cb81f99316734d9b2512b
font_01_sfnt_off00006514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6514 14844 bytes
SHA-256: 827bb14858799b3ce71e9ac9d979f5461d1ea09510e3c9ee50a6668a6f92cf96
font_02_sfnt_off00009340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9340 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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