Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25acd2ad8fc861e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 13:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f726be941c4f1c69eee54f337ce7c6cb SHA-1: b5a9758ad227e02526d72bcc42ead8b348dc9540 SHA-256: e25acd2ad8fc861ee9c209f79176e58ef7dfed9158c48012008d66302da7b9a0
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=surgical+tech+textbooks'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, luring users to a malicious site under the guise of providing educational resources.

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.me/wix?keyword=surgical+tech+textbooks
    • https://static.usrfiles.com/ugd/b8c837_5769e1b7c6f04deabef1f2ef0e60a801.pdf
    • https://static.usrfiles.com/ugd/10b11f_c2dbac9db4cf48b389980640bd7315f4.pdf
    • https://static.usrfiles.com/ugd/77941b_3c87cee5925541ce8f5523f528cb502d.pdf
    • https://static.usrfiles.com/ugd/8e1900_b00a3427078444128d4a2ef126c856f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce93d7e56684d80976aec5ef8e902b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_331ad7e87edc4c14a3869fe8a9245b56.pdf
    • https://static.usrfiles.com/ugd/b8c837_affe1b30498c467f87c4f69187cf9570.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/cell_structure_and_function_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/xifekobobugab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8615/files/nubezijuxetunafaxumipub.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/valentine_s_day_quotes_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/sogamisazuvasininulog.pdf
    • https://static.usrfiles.com/ugd/b8c837_f503b5c295b648b19252197c58d0108e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c5b2d63d23244fd94b587fa27ec72a3.pdf
    • https://static.usrfiles.com/ugd/8c0e65_86400d9459534b43b1a7368e1d1bf7ac.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_off0000511c.bin
d99620fa282f305b43e19b4e130dd9d51d93f9f96e106bffa03753995790be48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x511C 5212 bytes
font_01_sfnt_off000062e5.bin
b3c2283399f9e861137c4aa44a4d8b1631bc49fa03b465b5ab68a1579b952fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E5 10640 bytes
font_02_sfnt_off0000875b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875B 4324 bytes

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