Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5fa3fff18bbc87…

MALICIOUS

PDF

45.5 KB Created: 2020-07-20 09:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed703b303590205e6247c15538e116a6 SHA-1: 01a3294a6ceae536ee2da74e7022e4a091a90edf SHA-256: 2d5fa3fff18bbc8799fd5dc3edf85de8e383da12525d3a42c5389955150a7649
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL points to a redirector service. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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/pify?keyword=pictorial+representation+of+data+worksheets
    • http://files.communitydrugcoalition.com/uploads/1/3/2/7/132740502/terasibe.pdf
    • http://files.shoppiazzahomedesign.com/uploads/1/3/1/4/131454766/a83036931a4694.pdf
    • http://files.saintsjamesandandrew.org/uploads/1/3/1/3/131383821/lesanuzemetonan_xubopigetukek.pdf
    • http://files.genarchitect.com/uploads/1/3/1/1/131164132/jugeviditej-wevefuz.pdf
    • http://files.mrsquam.com/uploads/1/3/0/7/130775987/4777150.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1651/files/tetojufozituxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/naxiwez.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7514/files/keluwinukejiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/jametisejesijofabenenasax.pdf
    • https://kanuwajatido.files.wordpress.com/2020/07/90108030172.pdf
    • https://xarixejino.files.wordpress.com/2020/07/nadozugasumesuvuzufoj.pdf
    • https://bisoliwabogu.files.wordpress.com/2020/06/2058626902.pdf
    • https://fojijerox.files.wordpress.com/2020/07/4834409189.pdf
    • https://nipatojubob.files.wordpress.com/2020/06/67525107988.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/tuzaketodaxotaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/dunubinatavoliwigoriru.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/84794388130.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/lifapanewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/93828903526.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/18858867360.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_off00007444.bin
4f322144fd51c3ce2c936fc181a4d0840c779b10ec7530362a714b7cbaefaba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 5188 bytes
font_01_sfnt_off000085e3.bin
9110bf6897d6ad2f51d66a816cd2412976be8499c51f4780f88adaa467ac2fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E3 10080 bytes

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