PDF malware analysis — malicious · 67dceea8a55b54c7

MALICIOUS

PDF

43.1 KB Created: 2020-10-16 07:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 90728caddb5e341e4f3638f2f94a2e3d SHA-1: e1a33d016004700bc1f0073754260dba1ca6c2f8 SHA-256: 67dceea8a55b54c7d423e58c830d0387d4ff80e64e245a1e61b6276773d1f9ff

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an educational worksheet, which is a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this assessment.

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://ggtraff.ru/123?keyword=kinds+of+sentences+according+to+structure+worksheet In PDF document text
- https://cdn-cms.f-static.net/uploads/4367297/normal_5f873bf95ab4c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373776/normal_5f88f526495b3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370073/normal_5f88bd441cb7e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366405/normal_5f88fa82b59fd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370286/normal_5f88f21e76d94.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366365/normal_5f8761fb35a15.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369512/normal_5f887bf98874c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369768/normal_5f87fae146192.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/1/0438/3129/6160/files/historical_romance_novels.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/6489/2323/files/mejarizoputudekukifonopal.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0484/0459/4846/files/choosing_one_in_a_hundred_miles.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b68c9d33-ae29-4e06-9440-c5fe062bd359/1550770220.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/99399ae5-2f24-497f-beec-30ed45238385/lupuvakal.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ee265779-77cc-40dc-aebb-6eb63e360af1/75577241562.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fa213bbb-a153-4f5c-a7f0-a091120fc018/37649443592.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1216549d-6ce5-4fbe-bc64-c6130f426f4b/vemusapogidiwedadux.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e541b7f9-2b2b-4d26-846f-933628cbfc12/gogudaxinodezorip.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/aa6b18f6-0a59-4b27-b666-50df43342422/gawuremuwogaxotifi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c827905b-caf8-4a46-b479-089e3c2d6699/80676567534.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d00b8b53-bb3c-48d3-ab53-7f113d772e10/gefifefonizudena.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0266/8059/0521/files/east_hopewell_township_pennsylvania.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/6153/5132/files/medical_and_dental_council_of_nigeria.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0501/9084/4084/files/gigodepuguwajana.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00006b01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B01	5376 bytes
SHA-256: `5a6aa6dfb49eb6c2e28ff0de7de04dc2ff53a6bc6b3715ee62fdf936cb41447e`
`font_01_sfnt_off00007d51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D51	9744 bytes
SHA-256: `544521239cb2a156ac3acf8ae301e0919906a94c9080d2b498a4ab3e21493216`

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