Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d38d6b52c37defe…

MALICIOUS

PDF

54.1 KB Created: 2020-08-17 16:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a7436c19fc22a937502490dee3e81e SHA-1: 12338a9a78c3d698b12680ff77d4254104170bdb SHA-256: 9d38d6b52c37defe5ace7e921e01e8001f2073b0e848bc41ac04b136fb8b0e2f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented as a tutorial PDF, indicating a social engineering lure. The file also contains a mass external PDF link farm, with many links hosted on cdn.shopify.com, suggesting an attempt to distribute content widely and potentially mask malicious activity. 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.com/pify?keyword=android+espresso+tutorial+pdf
    • http://files.lisadring.com/uploads/1/3/0/9/130969371/1fd40.pdf
    • http://vixope.stressfreesettlements.com/uploads/1/3/1/4/131408100/nekizimezewiduf.pdf
    • http://files.megamarketingsvcs.com/uploads/1/3/1/3/131383743/tewisilix.pdf
    • http://files.hbmsmusic.org/uploads/1/3/1/8/131857305/63fa2814.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/convert_html_to_python_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/the_expanse_cibola_burn.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/gexonilawugef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/savijezirawiwiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/liregiwobidifoke.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/88021635479.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/46339655691.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/nipuwuzipikibigonodexez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/kemikaviruvolig.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3035/files/firoximujejonivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/fezuzomebifoxumizu.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_off0000966b.bin
1c1139c3872b94cf54f525f72227a977bedfdca3d7365916558a9b50f3bfdb03
pdf-font-stream PDF embedded font (sfnt) at offset 0x966B 5024 bytes
font_01_sfnt_off0000a78b.bin
6363775d61254f9469248d2d032def13a50ad45199b53b8d61383d32952b11e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA78B 10448 bytes