Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c080a09a764d73…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e52effb6f2eb734354f0231edc04aa4d SHA-1: 355d763ba23cc8ab40067e1b968aaad1b42eb8d5 SHA-256: 57c080a09a764d733a71b04cc2bd9eddc88e09d9e21557cf31728e880fabac7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector, disguised as a link to a textbook. This suggests a social engineering tactic to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=vander%2527s+human+physiology+15th+edition
    • https://static.usrfiles.com/ugd/7f16bd_e5bc8130500f4fc1b42ace9762080cdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dc2931988214758ae7ed0004285d4b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_119944b4b5ee4258828b5250fe89c084.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4b78f0c91ff4000a4e5cf4d52f44875.pdf
    • https://static.usrfiles.com/ugd/f515ca_76b0faeca560422181e91006c8079196.pdf
    • https://static.usrfiles.com/ugd/7198c1_0bd32b432871475385fdc8f1205ba8b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_53351a59099042eeb867c7a276f48a5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_656e513a77274f1c97b5d609382164e4.pdf
    • https://static.usrfiles.com/ugd/5b5da7_4d6682d233fb46e38deaba35f32b5bc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_404531e346b44571b85ab469ac98a2ca.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/guseb.pdf
    • https://cdn.shopify.com/s/files/1/0459/6049/5263/files/36048642993.pdf
    • https://cdn.shopify.com/s/files/1/0434/3981/6861/files/last_one_week_weather_report_in_hyderabad.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3556/files/xiwovukugoromibafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/lijapeziluvonu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/gewujelutif.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/74643737376.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/fepabajekanapunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/13463583221.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_off0000548d.bin
46e7cea41820dea04d92a719d9cc42eceaf64db8b6eeb5f724e42d6d279d2f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548D 5532 bytes
font_01_sfnt_off00006744.bin
500df47371c9a9e3383d7bbc818bf85a41393522c27c88efb69aeefa2e2536ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6744 9876 bytes
font_02_sfnt_off00008919.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8919 4324 bytes

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