Malicious PDF — malware analysis report

Static analysis result for SHA-256 152c1c139e9509ab…

MALICIOUS

PDF

44.8 KB Created: 2020-08-20 08:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40edb30016ac03498bb83ee501766060 SHA-1: f9dbb570deb5df8c5535f4e7a9e6acd27bc7de32 SHA-256: 152c1c139e9509ab2ea55d3ed2629280b97a07ed77ecff62f965a5599254d9ce
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 26 external PDF links, many hosted on Shopify, and one primary malicious redirector URL. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users into clicking it. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the primary URL leads to known malicious 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.ru/pify?keyword=happy+birthday+dad+wishes+video
    • http://files.intempodanceensemble.org/uploads/1/3/1/8/131871874/wedodav-tipuzajuvetidiw-luwotapupivegus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0460/3694/3007/files/11993036136.pdf
    • https://cdn.shopify.com/s/files/1/0429/9997/1999/files/89697318121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/bivuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/77012919945.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/xivirelisuberilanasatif.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/pozijomevewatun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/dovepaxobomevume.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/53682014066.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/67568161675.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/16451164516.pdf
    • https://cdn.shopify.com/s/files/1/0438/4142/1472/files/blogger_template_creator_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006478.bin
9819d5d1b5c76ef4b474113d4a573b2f65afe6a5e3c6a1c1c4ca10717d000ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 5052 bytes
font_01_sfnt_off000075ca.bin
74f2ebfa87527c4755e4e7d729011d068fb37dd6a31af14ed257072cbbd49e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 10088 bytes
font_02_sfnt_off00009865.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9865 4324 bytes

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