Malicious PDF — malware analysis report

Static analysis result for SHA-256 345e7f108b51b905…

MALICIOUS

PDF

41.4 KB Created: 2020-09-07 13:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e143fe124b058e2e7b2be21eb59f29 SHA-1: 8cb64fc9cea58d92d8e04e54f339978e139bcbd3 SHA-256: 345e7f108b51b905ad868d95746bf575bcf249421b2b65610958976faa4a37e0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body and the extracted URLs. The link, 'https://ttraff.link/wix?keyword=update+windows+10+1511+to+1803+manually', is presented as a lure for a Windows update. The presence of a PDF link farm further suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were extracted, the direct malicious link and the nature of the lure strongly indicate a phishing or malware delivery attempt.

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.link/wix?keyword=update+windows+10+1511+to+1803+manually
    • https://static.usrfiles.com/ugd/585b1d_b8f82d5a83ab477d9e2f1cbc9fc62d1e.pdf
    • https://static.usrfiles.com/ugd/1a89c8_db4104fcbad641879bb82db4bed9becc.pdf
    • https://static.usrfiles.com/ugd/b914b5_cc2e78a79af24b82bdaebdf1755c7ee9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e5c76cb68dc459cb6e0c3b9f42935c1.pdf
    • https://static.usrfiles.com/ugd/a13bc2_e9a44687e9bb41f7a0864a42cf94bd41.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/50344893628.pdf
    • https://cdn.shopify.com/s/files/1/0435/1836/1755/files/free_comprehension_worksheets_ks3_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/functional_strategy_and_strategic_choice.pdf
    • https://cdn.shopify.com/s/files/1/0431/7737/7946/files/book_review_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/64727292428.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0058/files/gerudo_valley_trumpet_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/68099840803.pdf
    • https://cdn.shopify.com/s/files/1/0437/3073/1173/files/cossacks_game_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/kusoxukowowawejuja.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/57166380282.pdf
    • https://cdn.shopify.com/s/files/1/0438/9280/1704/files/97223408990.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/70561846796.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/kufuju.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e8.bin
b5d63d87f5dbd2c473b560339cc4389d198821ab8be47d0bc5f82a1303dbda1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 5868 bytes
font_01_sfnt_off000075f1.bin
498d8cf908c0ca94ceb6407c0aadb6a420e1088e7b8c64a9e8d1becf90e0d646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 10100 bytes

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