Malicious PDF — malware analysis report

Static analysis result for SHA-256 788e04c1318b9a09…

MALICIOUS

PDF

49.0 KB Created: 2020-09-01 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccb5a17544a4d561e4ad4c23fc86b04 SHA-1: 5149dfa565471e3e3bee0008c13713b8f3a18c7b SHA-256: 788e04c1318b9a09965a7cc88103993a2d88335c5219d179339c95c83da5cbc4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host SEO-optimized PDFs. One prominent link, https://ttraff.cc/pify?keyword=comprehension+worksheet+for+grade+3+with+answers, is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational materials, likely to trick users into clicking the malicious link. 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=comprehension+worksheet+for+grade+3+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/80379287855.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/pradhan_mantri_awas_yojana_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/biological_anthropology_michael_alan_park.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/foxabiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/perisher_australia_snow_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8161/files/kikuwiguvikafedopulena.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/74501917122.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/93393273010.pdf
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/voseg.pdf
    • https://static.usrfiles.com/ugd/6350c7_bbaaf3c5405c44d3b2211e2ff749caa1.pdf
    • https://static.usrfiles.com/ugd/affb4a_d0024f10cef04f728dc7b09c334f160a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6276d66f8341b9a030b75f3b7c5ef1.pdf
    • https://static.usrfiles.com/ugd/a298ce_d7f849ec803e499faa7ea96d9e3b6c44.pdf
    • https://static.usrfiles.com/ugd/30e015_54dcdfc30a694990a4fa083d1480b15e.pdf
    • https://static.usrfiles.com/ugd/50c35f_0a9b6b57af9f4f1b9207e5a02a82fd81.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_off0000813c.bin
df0a6500b114eada35ee6427c27003a1e7abedcf2f219e2faed436f4adc59f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813C 5648 bytes
font_01_sfnt_off0000945c.bin
78cb0d203a8d5583d804ea7c2d61416e941ba6e66165f644729ba71457690814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945C 10044 bytes

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