PDF malware analysis — malicious · 1cf5eeb0ac72fa50

MALICIOUS

PDF

50.1 KB Created: 2020-10-28 11:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1fb51c608eac3a00ba2226054719fa83 SHA-1: 9dae803e8fc83650b5d007ca888d95c23d786a5d SHA-256: 1cf5eeb0ac72fa501dd82787fa891a20d3b79ecc56be57004dd0e5107062e2e5

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?keyword=bluetooth+fm+transmitter+for+car+radio'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/845487.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to trick users into clicking it.

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://cctraff.ru/123?keyword=bluetooth+fm+transmitter+for+car+radio
- https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/845487.pdf
- https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/vemigovu.pdf
- https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/271e84a5.pdf
- https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/1e2f73.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/b438e0c6-bb09-4daa-9806-149ff746d48e/ark_place_map_marker.pdf
- https://s3.amazonaws.com/wixamupelinere/anualidades_diferidas_vencidas.pdf
- https://uploads.strikinglycdn.com/files/71ae5bc8-eee5-451f-b68b-4c4af433e1bb/boxatoxupijod.pdf
- https://uploads.strikinglycdn.com/files/735590fc-a624-4cd1-9d6f-08261db58ecc/word_start_with_d_5_letters.pdf
- https://cdn.shopify.com/s/files/1/0496/6347/5869/files/tour_guide_costume_ideas.pdf
- https://cdn.shopify.com/s/files/1/0476/7481/8726/files/97188419351.pdf
- https://cdn.shopify.com/s/files/1/0496/1766/6197/files/pivot_table_data_range_multiple_worksheets.pdf
- https://uploads.strikinglycdn.com/files/998c1f86-fe69-411f-a8a0-ed1f79ce5f6c/situational_leadership_activities_an.pdf
- https://uploads.strikinglycdn.com/files/258ad3d0-4177-4825-bf60-52c0478408e2/91775123783.pdf
- https://s3.amazonaws.com/gaxuremewuger/45850500425.pdf
- https://s3.amazonaws.com/zonivezada/26371984199.pdf
- https://s3.amazonaws.com/paxivogedewilu/bubebasufujatariv.pdf
- https://s3.amazonaws.com/wilugugo/bj_fogg.pdf
- https://s3.amazonaws.com/lijulijowivaze/adobe_reader_full_version_free_download.pdf
- https://uploads.strikinglycdn.com/files/fcb387aa-2d74-469e-bd8c-ab404e096625/25007242776.pdf
- https://uploads.strikinglycdn.com/files/413e8ccb-9b5d-41a0-8da1-9607ec407e3e/zekilaruvivugunaguw.pdf
- https://uploads.strikinglycdn.com/files/f6d1f58e-6243-462a-bd9d-88ae883ae5f6/malexikukelapunivabir.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000084ba.bin` `d1545d0457d93e93479795ce80336ab17694d24c6efd8359715785de6ed8bc94`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x84BA	5308 bytes
`font_01_sfnt_off00009696.bin` `5ac2f252f9927aad47a0e7d632e675871f40ed5aedac2894db0ec105dd776199`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9696	10616 bytes

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