Malicious PDF — malware analysis report

Static analysis result for SHA-256 13da604ad28e78e4…

MALICIOUS

PDF

44.0 KB Created: 2020-08-14 07:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7e8d1092e0b7d2a157adb12b3d752b SHA-1: 21deaa8ba09b7acd518c9bf54c610cb415da18b5 SHA-256: 13da604ad28e78e47ec9711bc0956aaf281949836723a67221b574cbdfca5bb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious infrastructure, potentially for further exploitation or phishing.

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=communication+round+interview+questions+and+answers
    • http://files.katycupcakes.com/uploads/1/3/2/6/132695339/zamen.pdf
    • http://files.manestreethaircompany.com/uploads/1/3/0/7/130739069/fotujibesori-kosuboledimapim-pujonefezobo.pdf
    • http://files.freelancergcc.com/uploads/1/3/1/1/131163540/wikunixevo-zabibo-zulareximiwumes.pdf
    • http://files.lotusliondesign.com/uploads/1/3/1/4/131453455/5707383.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/mefavoditepowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/los_12_acuerdos_de_paz_en_guatemala.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/desercion_escolar_en_adolescentes_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/69862087841.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0561/files/industrial_craft_2_nuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/71757598454.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/setufakunomonalopukifam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/28169828244.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6039/files/assembler_un_seul_fichier.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/buchholz_relay_testing_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/71304305718.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/46165198523.pdf
    • https://cdn.shopify.com/s/files/1/0447/4611/3173/files/naming_cycloalkanes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/4878152126.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/english_words_with_tamil_meaning_free_download.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_off00006e9c.bin
17b47f58fd682ba4f7baf00de423995dbc7465713672c3f4b3bb8cea90cac763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 5236 bytes
font_01_sfnt_off00008059.bin
f6d2ab391f1c7fb589bd8027cda4692386ae94a29e171b064dc5a2dd458c4b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8059 9996 bytes

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