Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c89cd94b8d6cad…

MALICIOUS

PDF

48.7 KB Created: 2020-09-04 18:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3532203e1a2fdd63118f7045f81b1bdd SHA-1: 7798d13a80f459d1862a645b5a32794ebc93e7bb SHA-256: e4c89cd94b8d6cadfe976c9247fe79cccecc84d6c68539f997fc021ec54fccfd
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'ttraff.club'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring users to a malicious site via embedded links.

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.club/wix?keyword=angielski+czasy+gimnazjum+pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/bypass_icloud_activation_tool._zip_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/lenasarizosaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/geogebra_online_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/pozis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/97497280624.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7067/files/pathfinder_character_sheet_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/90223907117.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/46505828157.pdf
    • https://cdn.shopify.com/s/files/1/0460/3969/5524/files/46446431573.pdf
    • https://cdn.shopify.com/s/files/1/0463/1707/6637/files/92040090602.pdf
    • https://cdn.shopify.com/s/files/1/0444/3848/7206/files/ashrae_handbook_fundamentals.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_off00007b51.bin
fb29da23e8eaee914af97e25a022fe923f5b11a4accf1e3c7f4d6e705befa236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B51 5660 bytes
font_01_sfnt_off00008eaf.bin
7e336652d84c0fc89a4b26408cfabe990a58ac83d4a35ced015aa9cd3fe96cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAF 12192 bytes

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