Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffad71486031457…

MALICIOUS

PDF

44.7 KB Created: 2020-08-25 03:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d574ebafa9ca297221c48a310370dc SHA-1: 34e39f8a4fbae2e31688d8e9ac24191c7a37566e SHA-256: 7ffad7148603145785fe976a51a518dd23295d32f1cba8f552a720a08d0a717e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a '7th tamil guide 2019 pdf' and the malicious URL, suggesting a lure for educational content. The presence of a download button heuristic further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=7th+tamil+guide+2019+pdf
    • http://vuroroxa.yoyojake.com/uploads/1/3/1/3/131380771/sowup.pdf
    • http://lumorul.bonvistomedia.com/uploads/1/3/1/4/131407558/0f8f687aca6a49a.pdf
    • http://files.equivistacoaching.com/uploads/1/3/2/6/132696111/polumazub-wumaf-gogunoxo.pdf
    • http://files.cleftstrong5k.com/uploads/1/3/0/8/130813526/wugelojuzitevip.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0467/9576/files/time_lapse_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/kalagobexud.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/21756056103.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/sql_query_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/99962830610.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/interview_questions_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/dupifiketaresofax.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/attaullah_khan_songs_free_videos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/98141160141.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/redovamomavofowajoduguz.pdf
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/ncaa_bracket_spreadsheet_2019.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
stream_004_off00006806.bin
57b82d40b6fd39ff4c8bf266767eaea32de90c89afb0eab5a1fa23f5bbb692cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6806 10372 bytes
font_00_sfnt_off000054e7.bin
dc1bc5baf146f96319318eebc27e2b7cbbd165698ccf0e40a01cea74b63897bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E7 5648 bytes
font_02_sfnt_off00008438.bin
3746aa5b5985d2d830fb01e5c1620b10b88939dc480015a1bea5ddb063405cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 9844 bytes

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