Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8935acb61b50914…

MALICIOUS

PDF

47.5 KB Created: 2020-08-25 17:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1405e5725e95c569bb719eb5ee9e302 SHA-1: c00c0be6444743f67822241830f66ccb7f6610fb SHA-256: f8935acb61b50914f86f259104bcf12f8bb3050f6191c235dfe1fb122f4a243f
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.cc/pify?keyword=exterior+angles+of+a+polygon+worksheet+answers'. The document body, though heavily obfuscated, appears to be a lure related to educational materials, specifically 'exterior angles of a polygon worksheet answers'. The presence of a malicious redirector and the SEO link farm heuristic indicate a phishing or scam attempt. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=exterior+angles+of+a+polygon+worksheet+answers
    • http://bulupa.juliekelleytv.com/uploads/1/3/0/9/130969600/nanarejoxoduvizis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/zewisafupasugi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/rapawunojedolaguzavasop.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/89382193827.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/dumolusuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/54328507952.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/31123078761.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/el_diario_de_la_republica_clasificados.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/98701271394.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/35027446149.pdf
    • https://cdn.shopify.com/s/files/1/0433/6723/5742/files/kopafegewilos.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/49930170285.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/blouse_cutting_and_stitching_book.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_off000073e9.bin
85fd2b20fa5e4a639fec80c75b4fe0a2585598d059c910099e759eac3789efea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 5448 bytes
font_01_sfnt_off0000868e.bin
3ea91098d7816173dbd26587b7dc5ca3ddf328a88e06fec82fffd960be437dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868E 13520 bytes

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