Malicious PDF — malware analysis report

Static analysis result for SHA-256 7661f99bd0459328…

MALICIOUS

PDF

54.7 KB Created: 2020-08-18 15:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 568f11de9369ef17a7ed95b2867abc99 SHA-1: 141f292fb19e1e974ef2595b44c6b823234a5228 SHA-256: 7661f99bd0459328980527d81e3122f6beec96bdf71892486bc40cf248a5dafb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL and text as the malicious link, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=catch+wrestling+techniques+pdf
    • http://medep.bayfieldblues.com/uploads/1/3/1/4/131453060/dbbc9d34ad50213.pdf
    • http://zakunok.thehalifaxpsychologist.ca/uploads/1/3/1/6/131607062/1b6f955bbc.pdf
    • http://diruxegax.foothill-highlands-rotary-wine-tasting.org/uploads/1/3/0/8/130874519/penizamak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/tijadiwosamupijejitapakog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/fejolowegefozetuzojibe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/somanubonabibesigasudusu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/chemistry_notes_for_class_11_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/wibikanaxakow.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/phonetics_transcription_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/xedurupakakakezemiza.pdf
    • https://cdn.shopify.com/s/files/1/0448/7554/6791/files/careers_of_the_future.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/zefexok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/prevention_of_sc_st_atrocities_act.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/runepizijipugutimapija.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/base64_to_blob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aa2.bin
6841078ea9227f17c1e4d5dafaf05b8d0cae5b403b0b06589d6f4bed1d7c3aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA2 5432 bytes
font_01_sfnt_off00009d16.bin
17aa3e1ef0a93f0a7ee8900e39b25f339dd8b0d0aa39b53618b2b86e8063bf47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D16 10088 bytes
font_02_sfnt_off0000bfa5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 4324 bytes

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