Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ceff6fb903322…

MALICIOUS

PDF

51.0 KB Created: 2020-08-30 05:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38afba0eb5b05c93eedfd05f9d32ab85 SHA-1: 14022dc1fc281fe75f01d29485d6eb978aee2faa SHA-256: 872ceff6fb90332276ce5c741104b52f429fc682b636dd033efe93dc23f3503a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, identified as a link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=yahtzee+junior+score+sheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Yahtzee junior score sheet' and the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness.

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/wix?keyword=yahtzee+junior+score+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dfb5f8_f9b5d1cecad34dc9810849ca01fa6795.pdf
    • https://static.usrfiles.com/ugd/ab922d_8a67d18f8b7943fc92b402fbee4b0d84.pdf
    • https://static.usrfiles.com/ugd/c3f88d_d6be0d3b94d84f419bfffd4465b7ffc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa054a5fcd264abc984fea4c92328c5f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/alloplastyka_stawu_biodrowego_andrzej_pozowski.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/73150036229.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/jurnal_pneumonia_pada_bayi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/7259333503.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_05bedba54e9449babfa4ed37c6ece1b8.pdf
    • https://static.usrfiles.com/ugd/067ecb_073cf8c06d814fbda91089ceb263d953.pdf
    • https://static.usrfiles.com/ugd/538d67_360c41f2abe74e9abbb92b21e4d7f665.pdf
    • https://static.usrfiles.com/ugd/a382ee_168c8bd8c7ab49309717e9f4aa423b02.pdf
    • https://static.usrfiles.com/ugd/b8c837_1db9cf71629548d7b3dc077b23ff0c00.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cd07d6a290341e78b8e927004c7b71b.pdf
    • https://static.usrfiles.com/ugd/8b9728_74ae9a753bfd4c8ebf0e50eede518d48.pdf
    • https://static.usrfiles.com/ugd/0dd040_fed9618b74f149bd88870f91e71ace44.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6edc75832fdf4862a15377c2d2883489.pdf
    • https://static.usrfiles.com/ugd/b8c837_facd8f0f98a144e2b13d908f4d4011ff.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_off000089c0.bin
5acdd5ee001d37598af7f2863858ef7b73b05a17178f375bee8ae4fb27ea985d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 4940 bytes
font_01_sfnt_off00009a8d.bin
acc147ea9d27288bb7de6b77b7ad88543797a4ef77f5b6bd052c1ad3477b8ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8D 10640 bytes

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