Malicious PDF — malware analysis report

Static analysis result for SHA-256 47772ae7162f9388…

MALICIOUS

PDF

35.3 KB Created: 2020-09-01 11:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddc66a70e4db49c364deaada0bbe2746 SHA-1: 7d28506d187b0926be49cadb3d88b17e01640ff8 SHA-256: 47772ae7162f93883defb5e13eb7abc4652efd047b85564d045b9f797d25e578
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector at 'ttraff.me'. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains text related to 'prefix and suffix worksheets grade 2' and the malicious URL, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting the user to a malicious site via a link embedded within the PDF.

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.me/wix?keyword=prefix+and+suffix+worksheets+grade+2
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/lego_dimensions_minikit_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/12071843248.pdf
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/quiz_buzzer_circuit_using_555_timer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5543/9255/files/jusijatilujezarinodena.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/jelezipajit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/simplifying_algebraic_fractions_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/wanekurajubelotasikewowi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/70233383890.pdf
    • https://cdn.shopify.com/s/files/1/0433/4200/4375/files/the_bettencourt_affair.pdf
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/xiwofi.pdf
    • https://cdn.shopify.com/s/files/1/0463/2680/8731/files/motiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/momudimax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/spoken_english_offline_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/12879214377.pdf
    • https://cdn.shopify.com/s/files/1/0447/4650/6391/files/ccna_cyber_ops_secops_210_250_official_cert_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/english_vocabulary_words_with_meaning_in_tamil.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d1e.bin
e0c9e9e0a7194a724df4ec551a3401ad8e288eeb1537e4141f7732b6891558b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1E 5492 bytes
font_01_sfnt_off00005fe7.bin
fd13d18da9bc3ff7cd73c9102254d1c72f0021ca7cd2a74af1c861668a3bd30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE7 9440 bytes

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