Malicious PDF — malware analysis report

Static analysis result for SHA-256 9339f29ca7c72ac4…

MALICIOUS

PDF

36.7 KB Created: 2020-08-30 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0adf66fcfcd7102d961a319b60095ca SHA-1: ae2102423f710402a7859eed2b5dbf86d3835ded SHA-256: 9339f29ca7c72ac4cd60cb27bfec568b25ddcd4c67c9330e8648be2973c04e73
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=mil+std+6040+pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/california_earth_science_6th_grade_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/938784411.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/nafegitexa.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_c178c193993647daa74364f799d5318a.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ea20d14b0140ecba4d52c61cc1b7ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fdb069ff4f04dcbb37ab1446f3308e2.pdf
    • https://static.usrfiles.com/ugd/10e3af_1a31e0ce66214963bf661788e75b2a6a.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5311/files/dusixozade.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/love_stage_ep_1_eng_sub.pdf
    • https://cdn.shopify.com/s/files/1/0462/7644/4320/files/cantonese_opera_performance_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/ssg_by_laws.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/melody_of_the_night_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/pitojejarapifoluvive.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/wimusifuvalefogovudibabov.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_off000052c6.bin
c2379eb98f01cfd81235682b6a66fc91e4c776e904a63e360c01407e57bf73de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C6 5120 bytes
font_01_sfnt_off0000644a.bin
c624455eff1e4cb6dd952a343eba61b0ffb5ba7bf99b20e1ea9a22f8dbc3e7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 10028 bytes

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