Malicious PDF — malware analysis report

Static analysis result for SHA-256 929500ef83a8496d…

MALICIOUS

PDF

48.5 KB Created: 2020-08-13 23:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ebfe0489312f60c5c2fed2d991abee SHA-1: 50f6596f536f58a7ea5def080b3bcff4ff8a5b25 SHA-256: 929500ef83a8496dd464f47147e67bf4320c32a19850a8c1eaed2ac111f703d2
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to 'Biogaia gotas dosis pdf' and the URL itself, suggesting a lure for users seeking this information. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=biogaia+gotas+dosis+pdf
    • http://files.fidgetkids.com.au/uploads/1/3/1/3/131379296/03bb6994.pdf
    • http://files.jennadamberger.com/uploads/1/3/1/4/131437322/8588139.pdf
    • http://files.glcfaithformation.org/uploads/1/3/1/1/131163533/nutarojego.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/32956067052.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/fojiduvujikeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/ap_grama_sachivalayam_results_merit_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/1552620874.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/35111683203.pdf
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/zitipomasawudukivades.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/bisutalalaxom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/nudemu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/ligebigenida.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/zenison.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/ruff_ryders_anthem_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/valadimarasobedukapi.pdf
    • https://cdn.shopify.com/s/files/1/0446/4774/3651/files/andante_andante_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/38282415442.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/4597883162.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_off00007302.bin
68d4a855c3a6669a2b10a81e48ab526ae960769e6a24d3f6d211ac1f3a9abd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 4696 bytes
font_01_sfnt_off000082ff.bin
0a80e1b6167d9b239fdc61088ed27b1812c9d93df99d5d373cad9b7190da5b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FF 10584 bytes
font_02_sfnt_off0000a6ac.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AC 4324 bytes

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