Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a63e3d3eb7b23c…

MALICIOUS

PDF

50.5 KB Created: 2020-08-11 15:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79228a163ca136c18fa6ee2e101cd46 SHA-1: 4b97073004aa134e521abe07b430cae0a15a8778 SHA-256: 11a63e3d3eb7b23c9758536fa944a4d3b90d019981d3952d9fd5b26a1e79e82c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm, aiming to deceive users into clicking them.

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/wb?keyword=management%20accounting%20horngren%20pdf
    • http://files.dynastyenergyservices.net/uploads/1/3/2/7/132740378/c1b115f482.pdf
    • http://files.youthactionmemphis.com/uploads/1/3/1/6/131607321/kinuvexenugawagewefa.pdf
    • http://files.lco-team.com/uploads/1/3/0/7/130776200/vupowilono.pdf
    • http://gasak.maryheskel.com/uploads/1/3/1/4/131482975/7888c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/6569/1560/files/49746660262.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/remove_suggestions_from_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0448/8128/1191/files/brainwashed_sally_satel.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/32703795154.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/dugiturokunuzujekuterile.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/25712485168.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/99495336010.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/69848955213.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/nazuximusijimiwarav.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/zefitikolevofijotuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/821130.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/acca_f9_revision_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/mercury_90hp_2_stroke_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/lejafenofomi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d7.bin
822b67f41dddd9e9c59617ef1ad45dfc21332f71123452e8b53d1d2584622335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D7 5364 bytes
font_01_sfnt_off000083ed.bin
168e97213d963a66ee4d20f005ff825f81b6fb412cb826e51fb64edc3430e12e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83ED 9908 bytes
font_02_sfnt_off0000a615.bin
5447fc6185d3016a3a7fe035711c5a28a34801b448f354b7b1c00c570485b9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA615 16500 bytes

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