Malicious PDF — malware analysis report

Static analysis result for SHA-256 882649516960328e…

MALICIOUS

PDF

48.3 KB Created: 2020-08-05 05:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58b3a711a0b66d56b31979c1a646d5ec SHA-1: 20b87030a7bde9a00fb4a1797d391745e8e3532e SHA-256: 882649516960328ec1353d57a2d482558e631343bf374ba620681d406939cf7d
194 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 external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a malicious redirector link, and the ML classifier strongly flagged the PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Entrepreneurship management book pdf' and includes the malicious redirector URL, indicating a lure to download or access further malicious content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=entrepreneurship+management+book+pdf
    • http://files.amyjanestudio.com/uploads/1/3/0/7/130739684/gogibudozo.pdf
    • http://files.ikaruscoffee.co.nz/uploads/1/3/0/8/130813364/6313670.pdf
    • http://files.eldridgechurchofchrist.com/uploads/1/3/2/3/132302871/4371040.pdf
    • http://files.nowbiz.net/uploads/1/3/1/3/131382330/luvedusemaxigow.pdf
    • http://files.clevelandcountyhistoricalsociety.com/uploads/1/3/2/8/132815752/sobuju-rerilujefemimed-nejasakegefub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/wajuromuzepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/8496775627.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/japerexofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/new_years_eve_jokes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/golibuzizofifof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/danobadaderuzerojazave.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/free_factory_auto_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/13260044066.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/12919581452.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/491116730.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/16664771943.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/48190817669.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_off00007ed7.bin
4369cb571196698cb1a304fac7f7407b778855edd203db5adab08c0853e15870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED7 5584 bytes
font_01_sfnt_off000091ac.bin
fa41b4013b7ce175366c3af53b19bfc49adf39a86980ccaba5d521c0741f7da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AC 10216 bytes

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