Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a1e824513513e1…

MALICIOUS

PDF

39.6 KB Created: 2020-08-27 22:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6677f6b5f05ddb7689162c1e3d31a5e1 SHA-1: 76c6d2ae50bbf8a6aa0b34484b75465d98658b7e SHA-256: 02a1e824513513e10d3b39f38b7e6cf492f4908f3aab0a7b8a993a0093b7c2a2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files. One of these links, 'https://ttraff.com/pify?keyword=major+schools+of+thought+in+psycholo', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to direct the user to malicious content.

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=major+schools+of+thought+in+psycholo
    • http://webume.turncoatmenswear.com/uploads/1/3/0/7/130776271/tuzaro-naxugizina-keporajepo-savufujarevaju.pdf
    • http://files.jacksherd.com/uploads/1/3/1/6/131606133/6024745.pdf
    • http://files.ironthong.com/uploads/1/3/0/7/130775970/nefufuxisafereli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/8968/6681/files/cen_tech_multimeter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0340/3678/files/savalanofokujitinuxukizaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/active_and_passive_voice_interrogative_sentences_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/vepifexajewibodimipoxizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/88448886286.pdf
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/anesthesia_pulling_teeth_bass_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/37558586101.pdf
    • https://cdn.shopify.com/s/files/1/0439/4300/2270/files/simple_past_regular_verbs_exercises_multiple_choice.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/human_christina_perri_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/6063/9384/files/22938829066.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/zozovuruz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/different_android_versions_and_its_special_features.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc6.bin
cc126a4ae6da4c08229ffce0457ca84deb2c61658d9908930299da5a8fee9055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC6 5460 bytes
font_01_sfnt_off0000706c.bin
61c8bf2cfbea7bbcd07b116c26fbacec99d704b78cc02131513c04f3d4ca0acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706C 9720 bytes

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