Malicious PDF — malware analysis report

Static analysis result for SHA-256 729463adfcf35f75…

MALICIOUS

PDF

48.2 KB Created: 2020-08-20 13:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7dcaa13165a3ea4b8f1f3ddf88f4f5f SHA-1: 3e6bad8020565a709be72a316ff81101fcf2006a SHA-256: 729463adfcf35f757e796411cba3601bb9dce84d942b64f71217d2ebf2cdaa93
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains hosting PDF files. The presence of a 'download button' heuristic further suggests a social engineering lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=up+b.+ed+2019+answer+key+date
    • http://files.weymedia.net/uploads/1/3/0/7/130740429/sorudatuparapik.pdf
    • http://files.cristinasbridalma.com/uploads/1/3/0/8/130874544/vuparapisid_laparunokobufi_kigumuzuzebu_nukoxugifine.pdf
    • http://volideruk.worldsandgames.org/uploads/1/3/2/8/132816042/4142892.pdf
    • http://files.rohsalgebra.com/uploads/1/3/0/8/130873804/9428143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/famekovused.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/dowidukutuxiwar.pdf
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/xuloxazeguvolimigoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/neural_networks_and_deep_learning_a_textbook_aggarwal_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/lijajatinowamimivede.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/nudojemonasilubefijuba.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/40495473549.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/free_to_word_doc_converter_registration_code.pdf
    • https://cdn.shopify.com/s/files/1/0454/3483/1016/files/cisterna_de_quilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/repepaxe.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672d.bin
3b917d90327408618a1dafe6ff66c46dee77de172ba30cd9034d906db8f572a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672D 5824 bytes
font_01_sfnt_off00007b22.bin
3e6928929fc73c3266bc783d35c8c3dcdf6c40a7ed41ac805ae69fe3051b0ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B22 10568 bytes
font_02_sfnt_off00009ebf.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBF 16092 bytes

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