Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aee745c8457f924…

MALICIOUS

PDF

119.3 KB Created: 2021-01-13 18:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 336e9aab31c9fbde77b78e42e9f318cb SHA-1: 4e4132006e7c9de8f15cd63c07e551901f5bbce4 SHA-256: 0aee745c8457f924cdafc3abc0113625dc2c9d0262c404e3b55e2cbfe2de81ed
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link to 'cctraff.ru', which is flagged as malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a 'constant of proportionality mystery puzzle answer key'. The presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent, likely to phish credentials or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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/aws?utm_term=constant+of+proportionality+mystery+puzzle+answer+key In PDF document text
    • https://site-1176979.mozfiles.com/files/1176979/kefuj.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/sloth_meaning_sin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f95802cd1fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/jKgjzSv/18235832238.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/OghhgRu/37565207405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5feb0328dd106.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/gupojakami/49524270563.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/kuzujazuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/chroma_key_background_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/18109682915.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/epidemiologi_aterosklerosis.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/misutexoka.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/ccna_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/penulonivu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/bautagebuch_muster.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/70378377282.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sheets_and_giggles_jobs.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019c3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19C3F 29700 bytes
SHA-256: 41a0158c84f3a69bff84d3c9573dac6a6afd921a59c309bcc4b1d517971d2637
font_00_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 5260 bytes
SHA-256: 6f3d5cf62c02760d03da57f97fcf91f0d753e586ff6962faa5e7613e919e73f6
font_01_sfnt_off000174d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D1 11556 bytes
SHA-256: 59f66e21be7def9ce79ddd72708aac6d8a01e0c3964a01604617a5c554e9bec6

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