Malicious PDF — malware analysis report

Static analysis result for SHA-256 098150770654ba24…

MALICIOUS

PDF

63.8 KB Created: 2020-08-13 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed40c36a4a4f5802f9596c104255267e SHA-1: 224134dd2d9a8e1eb2b7c6b7103ec6918b9ca4e1 SHA-256: 098150770654ba24e1d96b8c8e25298649cdb150d60c3144131df437bf92a9e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=minna+no+nihongo+answer+key+2`. This indicates the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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=minna+no+nihongo+answer+key+2
    • http://saded.blindsquirrelcreativedesign.com/uploads/1/3/0/8/130873826/4198741.pdf
    • http://zewoteg.mccaulleysminidoxies.com/uploads/1/3/1/3/131381464/rurimo_romarotelekuj_pefosoxijiv.pdf
    • http://files.andysfinewoodworking.com/uploads/1/3/2/7/132712530/vogakebawe-fafereramu-tadafi-sazix.pdf
    • http://kabidajo.slocampnpack.com/uploads/1/3/1/6/131637136/pikesavekazuba_gefegeguwoz_nurepamavifagig_puwalovafaj.pdf
    • http://files.dcchurchofchrist.org/uploads/1/3/0/9/130969700/05a026610d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/56657488221.pdf
    • https://cdn.shopify.com/s/files/1/0432/4904/1563/files/netepilibelufivoligigozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/mtg_arena_preparing_assets.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/zoxuzadujizafejarol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/maguloroduvoruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/7987358359.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/95840486863.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/10409966646.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/42700147129.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/fejomujen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/sawuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/jazz_alto_saxophone_sheet_music.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca1.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA1 6744 bytes
font_01_sfnt_off00006d58.bin
b7f6e14e2657cde95bbe5d90a8248aedfa0d31ca4edb85ef813d64d5acb3a26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 13308 bytes
font_02_sfnt_off000098c0.bin
c37c1c21c09b0225044caeeebb8ed5949d034a0d4e61d4a0252437b295344576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C0 5308 bytes
font_03_sfnt_off0000aae8.bin
d02a82f0ebf7afbb4d06b3f04319c8b4e1442088b9bd9392af67f234feef9c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE8 14984 bytes
font_04_sfnt_off0000d93f.bin
64fad9c57913e4c3c7d8f2bfe1ce3c3bf2be9f1c2cadcc76c76fed44a8221e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16340 bytes

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