Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4a085b60a8cab7…

MALICIOUS

PDF

42.9 KB Created: 2020-10-06 22:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9450936d49f4b9a1d3fd2b291141861 SHA-1: 202a70bcdedc3517e32c7aa23ffa4dc3f073b658 SHA-256: ec4a085b60a8cab7482383ebbb5411b823081634e8a13f67086c3c16fa16cd1a
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, which is characteristic of a link farm or SEO spam campaign. One of the primary links, 'https://ggtraff.ru/strik?keyword=light+energy+worksheets+1st+grade', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its central role in the malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=light+energy+worksheets+1st+grade In PDF document text
    • http://files.allysonboate.com/uploads/1/3/1/4/131437889/1279305.pdfIn PDF document text
    • http://kejikove.clevelandpropshop.com/uploads/1/3/0/8/130874317/rasepo.pdfIn PDF document text
    • http://files.zoveaux.com/uploads/1/3/0/7/130776166/wimegobotofime.pdfIn PDF document text
    • http://nogagujid.closeencountersrhot.com/uploads/1/3/2/6/132696067/1382406.pdfIn PDF document text
    • https://site-1041950.mozfiles.com/files/1041950/42490642360.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/91597408000.pdfIn PDF document text
    • https://site-1038988.mozfiles.com/files/1038988/pubazarigoxoxame.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/26003016440.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/fobawedewewokeraraf.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/165a8fb3-7d7c-4270-97cb-4e23f5275dc6/5010083716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78af51d-e437-46d9-b208-c79fae35141b/dujeranazijakodawedon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c2df8e-4ce3-406a-b5d1-49a416e3ea18/25238210188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12813cd-6dab-4b2f-afd7-996fc04f568b/samim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/61004699883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/green_guide_dresses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8432/4504/files/jegobebozugumojopojefej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7131/0490/files/skyrim_stalhrim_weapons.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_off0000694c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 5308 bytes
SHA-256: 9f4ebab253a63f5ade0099a4057857d9032529df0107b0df345f7f0a6139681c
font_01_sfnt_off00007b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B76 10280 bytes
SHA-256: 33e3e52dd30f1a856fcb5ea1af8d7cedad8e4183e3e60bd82060d37b372e885d

Open this report in the interactive analyzer, or submit your own file for analysis.