Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d20ed95bc51f38…

MALICIOUS

PDF

87.5 KB Created: 2020-08-14 12:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c694d7d057000c47000f7d03cdc3f6a0 SHA-1: 6fc32e9847682131cad612707ad39c02d76a09cc SHA-256: 42d20ed95bc51f389480c55300777db9ba271027223cf05467921e715d871fc9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/wb?keyword=hsk%204%20vocabulary%20list%202019%20pdf. While many other URLs point to benign Shopify domains, the presence of the redirector indicates a malicious intent to lead the user to a harmful site. No scripts were extracted, and the document body is heavily obfuscated, but the overall pattern suggests a phishing or redirection attack.

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/wb?keyword=hsk%204%20vocabulary%20list%202019%20pdf
    • http://files.jamesvandenburg.com/uploads/1/3/2/3/132302963/4d885a59.pdf
    • http://files.mgdinglegbhughescollection.com/uploads/1/3/2/6/132696030/9eeab5d87b.pdf
    • http://files.ncwattorney.org/uploads/1/3/0/7/130775371/cd2cb027fa4e.pdf
    • http://files.womanite.org/uploads/1/3/1/4/131453402/1111468cc6dd4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/21713395870.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2974/files/47061817635.pdf
    • https://cdn.shopify.com/s/files/1/0454/3338/9214/files/energias_alternativas_en_venezuela.pdf
    • https://cdn.shopify.com/s/files/1/0436/0480/3746/files/quality_assurance_and_voluntary_accreditation.pdf
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/good_english_grammar_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/lubesawamomarebenitik.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/audit_case_study_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/download_cydia_ios_8._3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1268/files/banshee_350_twin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/78488544627.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/36385860966.pdf
    • https://cdn.shopify.com/s/files/1/0433/7185/6026/files/tuvezetuzolibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/50114054127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000910f.bin
e044afd71c794a9cf6519a850d240a31aa04d2803f8d804fdb66bedbfb1e2cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910F 39476 bytes
font_01_sfnt_off00010966.bin
1e74ce7804a6f90450e49492fe3ea93686a5ba33bbb1e1be6af4af5cdbe5de61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 6044 bytes
font_02_sfnt_off00011e10.bin
44e857761b6085c217e74779cb78836fead0ac840ad51c5674a71f1cb8c609e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 17748 bytes

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