Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caf3b0913e57dd9…

MALICIOUS

PDF

74.1 KB Created: 2021-01-10 00:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fea806cde890115dade04e4baffe3cfa SHA-1: ec1f57652860272cdeff9ebb5000412dab62f48a SHA-256: 9caf3b0913e57dd969dcf0baa8da15b2c72c82e1006c9afca801664c89c7ae4d
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to study guide answers, aligning with common social engineering tactics. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a malicious download or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=the+house+on+mango+street+study+guide+student+copy+answers PDF link annotation
    • https://site-1174607.mozfiles.com/files/1174607/dj_marshmello_friends_song_download.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/2e6a9ea9df4.pdfIn PDF document text
    • https://site-1177498.mozfiles.com/files/1177498/cool_fonts_keyboard_for_instagram_bio_apk.pdfIn PDF document text
    • https://site-1176402.mozfiles.com/files/1176402/buried_treasure_neopets_guide.pdfIn PDF document text
    • https://site-1174202.mozfiles.com/files/1174202/31153431927.pdfIn PDF document text
    • https://site-1178590.mozfiles.com/files/1178590/south_african_antiretroviral_treatment_guidelines_2018.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/49528280366.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/pen_and_paper_icon_in_outlook.pdfIn PDF document text
    • https://jonoxuxiwef.weebly.com/uploads/1/3/4/3/134314506/ab5053adf44.pdfIn PDF document text
    • https://site-1168430.mozfiles.com/files/1168430/65388257878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/growing_up_with_a_bucket_full_of_happiness.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/93132132154.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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 5596 bytes
SHA-256: d33796ac76e25103c8c57e85be561a008f4a198a45ffb2cfbd5315cc6f991872
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10920 bytes
SHA-256: c2df26701851f3615a90b9c533f9b00e108d339d4b378f90b0e0d3214bc08cee

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