Malicious PDF — malware analysis report

Static analysis result for SHA-256 86533b5b37ae5250…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 00:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 478b06fb255cdc7ee288bbebe6fd0ecf SHA-1: ff9c88c1cbe8d0ed47fda5702d1c7440c1fdaa16 SHA-256: 86533b5b37ae5250a7848f5ff9a0ee151c1d3213bf93ab7c14d2986f93ad5b89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate traffic. One of the primary links redirects to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=abstract+painting+techniques+pdf
    • http://files.mectacprinstructor.com/uploads/1/3/1/4/131437740/2f469132278.pdf
    • http://files.bournemouthjrc.co.uk/uploads/1/3/0/7/130775466/ninebolavonuke_pojejo.pdf
    • http://files.gradeeight.nestmusic.org/uploads/1/3/0/8/130874467/6db7fe27d8bab.pdf
    • http://files.ctlymelight.org/uploads/1/3/1/3/131383318/midep.pdf
    • http://files.siliconeallie.com/uploads/1/3/0/8/130873932/1163512.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/tumematakakagugagawivet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/sijonorulinefusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2493/3287/files/pofimevejezuwukuvanuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/fexifezibid.pdf
    • https://cdn.shopify.com/s/files/1/0449/9243/0248/files/60760643489.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/nodubopigojibunig.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/76829242547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/pexufowitatogaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/fimexofis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/92474233651.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/vojepemofeberafetitalot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2063/files/66695572563.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_off00007234.bin
57fe3ac732e93c2974c7a8be1139e90bb6c29b725640aef526879fdf5faacf91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7234 5640 bytes
font_01_sfnt_off0000854a.bin
4e40214572a5d8a25e7aaaca1715b10fd8c4f072d51cd9f63d69d37281a1782c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854A 10376 bytes

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