Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aa4e23d980bc1e…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 22:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b0341fa841b58428d795508d46d5343 SHA-1: 24600ed584b61e28adec1b0361539d135e1a5057 SHA-256: 02aa4e23d980bc1eae06b110b47062ff363764e442966dbb4de76ffa39111f4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'word processing software pdf' and includes the malicious URL, suggesting a lure to a phishing or scam site. 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.cc/wb?keyword=definition%20of%20word%20processing%20software%20pdf
    • http://files.akadeltapsiomega.org/uploads/1/3/1/8/131857270/fadila_kuwaselilinuno_gefig.pdf
    • http://files.countrylucklife.com/uploads/1/3/2/7/132712209/talozeleji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/vawadiledupev.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/christian_theology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0439/4283/8427/files/75453799428.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/free_to_ms_word_converter_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/american_funds_forms.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/46354196859.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/78109765056.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/57363300719.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/46152666928.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/baxurupejamiwisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/23436135795.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3c.bin
57565736a145a893b9056bb3c0d3d3a7e7c165ad889a0877b06143612eaf5178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 5168 bytes
font_01_sfnt_off000070f1.bin
632f5ceb495603fef4a57d4cd8fc2d242d6da2a24eac9617ae22cc606a68be3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F1 9996 bytes
font_02_sfnt_off0000930d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930D 4324 bytes

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