Malicious PDF — malware analysis report

Static analysis result for SHA-256 179d49bcc047dad1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-24 09:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e958092a95364492757020b3401f97 SHA-1: bedf831291bdf882d40288b1b4c3fdeed611e247 SHA-256: 179d49bcc047dad1bc725923fcf942944c27ebeba967fdcfe9287a6c245a3af9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a game or app, and includes the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to distribute 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.ru/pify?keyword=2nd+conditional+game+pdf
    • http://files.cumcvb.org/uploads/1/3/0/7/130739456/sojebenoz_xuperatuzowab.pdf
    • http://files.villagedrivevillage.org/uploads/1/3/1/3/131380107/5511002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2567/0042/files/best_offline_spanish_english_dictionary_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/pdf_file_editor_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/22871345836.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/sidunupa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/42227052674.pdf
    • https://cdn.shopify.com/s/files/1/0431/8422/6453/files/term_loan_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/adverbs_of_frequency_questions_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/12796858930.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/ciencias_naturales_cuarto_grado.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/musawojonelulowad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/98716450963.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/lezojogawufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5130/9473/files/sybcom_business_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/3368/0282/files/sanegifitek.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_off00005efe.bin
21906463551f61ee2a8135b105863c58c3608dbc33f572cee0fcbd323e4aac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5028 bytes
font_01_sfnt_off00006ff5.bin
64585cfe983eeeed9098f7cc74329db14bc149e2912e1fcd23b40b156dff9f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF5 10128 bytes
font_02_sfnt_off000092b1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B1 4324 bytes

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