Malicious PDF — malware analysis report

Static analysis result for SHA-256 5840d27b7b395e1b…

MALICIOUS

PDF

63.0 KB Created: 2020-08-30 06:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76ce35441e5193616be7c466cc3e76d SHA-1: f27730ef553f2fa5ecdf361755cbaf1593a46748 SHA-256: 5840d27b7b395e1b31797946504a1effbb5a424178d8664234d93394535083b4
152 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, pointing to various domains including a known malicious redirector at `ttraff.cc`. The primary purpose appears to be directing users to potentially harmful content or phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=minecraft+dynamic+lights
    • https://static.usrfiles.com/ugd/b8c837_2f5f02556bc54717b8328048df782305.pdf
    • https://static.usrfiles.com/ugd/55cc32_1dabc8dd7c86447cbfed68e5bbc15246.pdf
    • https://static.usrfiles.com/ugd/e73fea_1f6b3744b28d48be9951521acb1a18d7.pdf
    • https://cdn.shopify.com/s/files/1/0457/8276/1628/files/24869592781.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/42260182007.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/tegofoxejolodoliloteduv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/centrifugal_pump_checklist.pdf
    • https://static.usrfiles.com/ugd/8d57bd_fecd85758f494d3fba3480a22a217600.pdf
    • https://static.usrfiles.com/ugd/5438e3_d85fb4d1c3b748069cf3583693b123d0.pdf
    • https://static.usrfiles.com/ugd/d01287_cee0f1d75ae542179f78f650ad2cbe00.pdf
    • https://static.usrfiles.com/ugd/b8c837_7622f55199d546b286caa0a98f8d63ee.pdf
    • https://static.usrfiles.com/ugd/5b9365_a5fd171dfa4b4c4282560a918c7004d2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/latest_catholic_songs_mix.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/prevention_of_sc_st_atrocities_act.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/antigone_robert_fagles.pdf
    • https://cdn.shopify.com/s/files/1/0452/5355/8434/files/english_vocabulary_words_with_meaning_in_punjabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac5d.bin
ccafc9fbc7e666bcf815fb616cf3f2531583724d5672daa6fedd951e6874d44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5D 5220 bytes
font_01_sfnt_off0000bdf3.bin
487a692ece2ee0fdb81ec611f95a4c8f3930e2aab383e7b4caf12510bcf96ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 10332 bytes
font_02_sfnt_off0000e13f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 4324 bytes

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