Malicious PDF — malware analysis report

Static analysis result for SHA-256 339c3736e147c273…

MALICIOUS

PDF

62.6 KB Created: 2020-10-16 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab5594bc76e6f9b303ce9dbfe636451c SHA-1: ed3fadff16b3aca98c0f2ee9da5bc7ab3d747134 SHA-256: 339c3736e147c273dd2b297cb51a8abbf3f03d831176766855f0f64c05d5ac82
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic. This suggests the primary purpose is to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?keyword=hepatitis+fulminante+por+hepatitis+a+pdf In PDF document text
    • https://site-1038693.mozfiles.com/files/1038693/57695179294.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/21556979955.pdfIn PDF document text
    • https://site-1043237.mozfiles.com/files/1043237/31183031105.pdfIn PDF document text
    • https://site-1043117.mozfiles.com/files/1043117/20497480712.pdfIn PDF document text
    • https://site-1039188.mozfiles.com/files/1039188/islamic_stock_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f86f709aa6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f871d6459ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f88b9c8539ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f88bc530ab86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f880561c11ad.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/1/0438/3955/3696/files/97666000495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/0877/0467/files/maverick_roller_coaster_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0659/3696/files/81145932222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/tusuvodawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4200/4375/files/the_masks_twilight_zone_full_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3b3198-f656-46db-9070-35c60bfe7410/nubewafowirimuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93a8234-5355-4503-b936-773e28d0a83d/rowozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de329d3-3280-4764-8f23-a73071009c65/dexesofomixupuxinagoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff88f95e-5115-4980-b995-04d99a0a1cef/rewezabapevujev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e64501-c309-4cfb-835a-70fd419d3314/89044165316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9537a32c-d07d-49df-93e2-409479cc9dc3/mabolizutivarigune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2848a7c4-4716-486e-b581-bb76d178f098/fefowid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc95eda-ea8c-4ba0-afdb-50373f80377f/donagijapakadizuzisufoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2888/8217/files/the_book_of_truth_paul_selig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6575/9675/files/9280757541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/lasimemota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1310/6596/files/a_room_of_ones_own_by_virginia_woolf.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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 5240 bytes
SHA-256: b8db306268f35785aa9c433f5f9620f40e61245736a33ce75366e57b03007fc3
font_01_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 10712 bytes
SHA-256: af0bd10364e3389e52b6f5fe5589492d698cfe7475ce864444d9af123a5651e8