Malicious PDF — malware analysis report

Static analysis result for SHA-256 88edc9fabb5493b7…

MALICIOUS

PDF

45.6 KB Created: 2020-08-05 14:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ccbdd772a34ae07cc150cb2d3cc47c8 SHA-1: be75f21412ffc09ae5d826ba2b8602ef5466d50a SHA-256: 88edc9fabb5493b75a6d86b386f979fc6121c9c0ef42fe85a1284fc6afe671d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. It also exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which point to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or SEO poisoning.

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/pify?keyword=bandung+tempo+dulu+pdf
    • http://files.physioplusguisborough.co.uk/uploads/1/3/1/0/131070379/fukuwisepowe.pdf
    • http://megomakil.abs-lao.com/uploads/1/3/1/4/131453541/desopotaj.pdf
    • http://files.write-the-vision.com/uploads/1/3/0/7/130775174/47a537.pdf
    • http://files.justanhrgirl.com/uploads/1/3/1/3/131380213/tixobeboz-pirugamom-notopenoru-zugutolivex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/ssc._nic._in_mts_result_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/larakupadufupesaliruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/muxubiromivojemote.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/wuvogamababobomeper.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/25710125910.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/48654861569.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/health_benefits_of_chia_seeds.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/5421996066.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/gomapiwarejonopat.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/utau_download_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/zokar.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/makisikarediwusanivexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/lurufekozaguwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/gudodifemogefiredesevuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/vexefov.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000760d.bin
c7a0923a1406553b14a3c87b7a882c3e97709bcc5ee88288fa91bc6549a8eb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 5136 bytes
font_01_sfnt_off0000877e.bin
594167ba8b8448ee1c83a22fec9567d8499e45cc5e821ec811efaa705455f771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877E 9900 bytes

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