Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a09237322c6220…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 02:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0dc605d17bf9e86985c59d7f5681727 SHA-1: 3804732f81d647b348134f98d54b9165666b1682 SHA-256: 15a09237322c6220d3d343230643f0a67cef01ba9bd8682127806a8f33e0f019
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text that appears to be a title and references the redirector URL, suggesting a lure to a malicious site. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious content.

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=analisis+luces+de+bohemia
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/kaxitesozamivajudu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/papikorijej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/dalosujiremu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3273/7942/files/biometric_attendance_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/how_do_you_reset_your_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/nojazepotemajasuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/zalabosuwagokejuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7110/files/78396430911.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/mezitexurutozin.pdf
    • https://static.usrfiles.com/ugd/3aca14_7300f3f37dab40f0a335a893ea6d567a.pdf
    • https://static.usrfiles.com/ugd/ca32a8_4334a46e65e54667941503cd5f703496.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://static.usrfiles.com/ugd/e3325f_454a1793dc734b30944aa33a1d626930.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/bls_provider_manual_american_heart_association.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0637/files/airdroid_apk_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/wurumi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/guided_tours_singapore_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0435/6843/1265/files/derivative_formulas.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b7.bin
fb931ef87de66d61e52e55e3fa4d1d037f1309a44690c4352e62eda87bcc441f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B7 5212 bytes
font_01_sfnt_off00008639.bin
b4061ff705d2dc42cdd9755aa98c37d16750f19ae136a637c3c96185e53f2627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8639 10876 bytes

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