Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a31401636a86b24…

MALICIOUS

PDF

66.3 KB Created: 2020-09-08 18:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a107588ec63f18cb6e0854655cb328 SHA-1: c1818831a13847413c650f43aeaadc2954cc5ee6 SHA-256: 4a31401636a86b243c62e1ab9c5627b75c447c347bfbe6e718b640c62d7d07dc
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL pointing to a known redirector.

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.club/wix?keyword=horizontal+scroll+bootstrap+template
    • https://cdn.shopify.com/s/files/1/0437/8329/1029/files/zalezilasutaramoboba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/dirakoboluragi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/canon_pixma_ts9120_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3928/3608/files/arditi_del_popolo.pdf
    • https://static.usrfiles.com/ugd/0286dd_89afbc39360849a19bd2c30806af2ced.pdf
    • https://static.usrfiles.com/ugd/6812d7_823a5f8c0c1b42d39e7e6394ab9de019.pdf
    • https://static.usrfiles.com/ugd/ea78e0_a8073300be8648509da2c570cec58350.pdf
    • https://cdn.shopify.com/s/files/1/0432/4098/0643/files/reform_party_candidates_2019_mauritius.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/zabomiwokuseja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/48445498656.pdf
    • https://cdn.shopify.com/s/files/1/0431/2871/7463/files/fojogokotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/marejipuwiwimelizev.pdf
    • https://static.usrfiles.com/ugd/ab922d_6fa092c4126d434fb12edad380bf4294.pdf
    • https://static.usrfiles.com/ugd/2ca22b_473ad31662384271870ebe7eb3c19637.pdf
    • https://static.usrfiles.com/ugd/0511f5_7da76cfeedec4eb6ac3318cc0bc6aaf6.pdf
    • https://static.usrfiles.com/ugd/36f25b_26cbb0fde42a44b3990cc6e1d997705d.pdf
    • https://static.usrfiles.com/ugd/e6092c_e9f69ba32a9a4676b7a4b4fadc371b3b.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_off0000c78e.bin
fe2de490bd13813603e4a22bd075e9fe8d006d80db738160168bf94d1a359280
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 5228 bytes
font_01_sfnt_off0000d945.bin
bd025cb03a7a17bc63db66196eff1ddbcfbff6348a321f64cf0395c4525e2a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 10088 bytes