Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7cf2349dc40dd2…

MALICIOUS

PDF

41.9 KB Created: 2020-08-16 01:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b41d41b33f178dadf54e1a4bb4a1ec7 SHA-1: 57febfcdcd1628561b82e46203e53927ffcbe93c SHA-256: 5a7cf2349dc40dd22a2fa34cdf7cbb3bab5c9c54b8a59a23451b72b9f56f2cdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document body, though partially corrupted, includes the URL and a title suggesting a lure for users to click the link. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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=wet%20op%20de%20ondernemingsraad%20pdf
    • http://files.vomorenburg.com/uploads/1/3/1/1/131164431/5580987.pdf
    • http://files.victoriacircus.com/uploads/1/3/1/3/131379406/1730083.pdf
    • http://vokiwege.scaffolddawgs.com/uploads/1/3/0/7/130739059/5f08b7a7.pdf
    • http://zudowi.buyportlandstores.com/uploads/1/3/1/4/131438025/jimakuk.pdf
    • http://nubexe.pattyschroeder.com/uploads/1/3/0/7/130775732/3231517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/muputamureg.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/vuliwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0199/files/7801030819.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/barbara_cartland_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/14184571691.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/fuzedakijaruzukage.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/dd-_214_blanket.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/6339962295.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/addition_and_subtraction_word_problems_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/sirir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/href_lnks_displaying_as_plain_text_php.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/eleventh_hour_cissp.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/tomiseno.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/the_danish_girl_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/saxuri.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_off00006460.bin
7e6ada507389f2518eced3eb543d1a8df9e269c75d2b0380ee2121934a8add7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 5344 bytes
font_01_sfnt_off00007681.bin
16e17d01bc4139528684676628adef7672e9ddbdc88c8cfa06f8792fe22adfda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7681 10540 bytes

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