Malicious PDF — malware analysis report

Static analysis result for SHA-256 617bbbff5487f02c…

MALICIOUS

PDF

56.6 KB Created: 2020-08-01 14:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 529116c1be16104bd171a4e01e8767ce SHA-1: 1e7a7d0114ee20a48ee8f2b545d348776efe67dd SHA-256: 617bbbff5487f02c00767bb43f7d4a48abb5be769f28da9d13e08e06e0218cc7
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant number pointing to external PDF files, suggesting a link farm for SEO manipulation. One of these links, https://ttraff.cc/pify?keyword=php+base64+encoding, is identified as a malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector indicate a likely attempt to lure users to malicious content or infrastructure.

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.cc/pify?keyword=php+base64+encoding
    • http://files.brainerdmusic.org/uploads/1/3/1/8/131857540/9ccb50de757dba0.pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://files.nadiahgoff.com/uploads/1/3/2/3/132303010/wujunib.pdf
    • http://files.nyacklibrary.org/uploads/1/3/0/7/130776037/numemafone.pdf
    • http://files.brittmerl.com/uploads/1/3/0/8/130814052/c41ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/tokogisawop.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/genie_intellicode_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/jatufedarutej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5153/9866/files/fedijurudasuvoragatuwodug.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/83222297716.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/xokamopajarapiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/losukedevurol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/5163643409.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/dopinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/40189580090.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/96533923856.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/66456959094.pdf
    • https://cdn.shopify.com/s/files/1/0431/7668/9825/files/pupobululafuwajedi.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_off00008d43.bin
af0feb4ac7f7949c53e29e312993f68c65c77bd84b909b572ffe6a828134c27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D43 5592 bytes
font_01_sfnt_off0000a048.bin
3b4401e23266bf021eca59b6d20079df61144d142411ccbc079c4f0b24f4b6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA048 16208 bytes

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