Malicious PDF — malware analysis report

Static analysis result for SHA-256 3521f16113ad2b64…

MALICIOUS

PDF

49.8 KB Created: 2020-10-30 18:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9bf87f79ae55c918897e52cffdceb2be SHA-1: 29dd3d458fee294186dbf2f4e2d7080e05ac1617 SHA-256: 3521f16113ad2b641d46b03c8723262cf462143df26544e47c360035e7cddf15
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, with a critical heuristic identifying it as a link farm and another flagging a link to known malicious redirector infrastructure. The embedded URL 'https://ttraff.me/123?keyword=color+mixing+worksheet+high+school' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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://ttraff.me/123?keyword=color+mixing+worksheet+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f8eff7a5963a.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/1/0481/0201/5139/files/puzzles_and_dragons_fusion_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/dibep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4542/1205/files/homewerks_bluetooth_fan_light_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f2a1a0-aa16-4b15-962a-32782edb8159/jupulatumolokopimafinoguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b88c65-f0d8-4f93-8337-67eecfa7af68/49595417047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9386/1553/files/calculadora_cientifica_hp_50g_apk_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8153/8975/files/sekukezajevenekewuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e47f180-d8a7-414e-9a53-3e09318c88af/namigisidavunozomubiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7701/4182/files/99841352578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2775/7216/files/idle_heroes_mod_apk_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2698523-385d-4db0-bf57-d03b3652d41c/7933035596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0891/3319/files/liwivirasat.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_off000076f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76F2 5040 bytes
SHA-256: dba30b2bd5b72d7bd89d99e13cf2eb314057ab21c96c5d79990e1b9adb6b773c
font_01_sfnt_off000087fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FD 10592 bytes
SHA-256: 50afa21f7a33b6cfb48dfc52a8ca1a9d256ef3c7745d472294ac4bf6ffffbd31
font_02_sfnt_off0000ac01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC01 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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