Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fcf15abc475cfc…

MALICIOUS

PDF

47.9 KB Created: 2020-07-22 22:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed18ca8e286485a85d8fd72eceb31af5 SHA-1: 242502effa8c0b7a9f368db063b23a0076bc30b4 SHA-256: c5fcf15abc475cfc03b2256ed7bd97b9739796600dc9b8a4bdd80fc0026ccc2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This indicates an attempt to redirect the user to a malicious site, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'long division worksheets', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further supports the SEO link farm heuristic, indicating a broad distribution attempt.

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/wb?keyword=long%20division%20with%20remainders%20worksheets%20pdf
    • http://files.nzsea.org/uploads/1/3/2/6/132681625/f32cdd63afacf.pdf
    • http://files.3mbc.org/uploads/1/3/1/3/131382491/2938198.pdf
    • http://files.mrspeabody.com/uploads/1/3/1/4/131438228/1611131.pdf
    • http://files.czonecoaching.com/uploads/1/3/0/7/130740044/3906206.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/36163887491.pdf
    • https://cdn.shopify.com/s/files/1/0441/0431/9128/files/zutuzujitawajizifoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/70702032498.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/natawanegoromij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/meruzetisemod.pdf
    • https://nuxizosa.files.wordpress.com/2020/06/besokoje.pdf
    • https://bikigex.files.wordpress.com/2020/07/74998915636.pdf
    • https://fajadofavano.files.wordpress.com/2020/06/64231955506.pdf
    • https://xowesavuwemu.files.wordpress.com/2020/06/13148915640.pdf
    • https://kulovop.files.wordpress.com/2020/07/xorebomuzizoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/80278560113.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7563/files/23353893415.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/rajirojila.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/sasawajebokareji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/dukajatirowovifudonad.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/69499647284.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/jivinaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/30115365744.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007567.bin
856fac02e5d55456b223f3550e40c31477e083f567632db0b8068d717b6b4a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 5368 bytes
font_01_sfnt_off00008795.bin
63053e28efbd2a8be3578d5ce3f1b65629899cd69d2bbc37b3aacc34eb52868f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 13468 bytes

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