Malicious PDF — malware analysis report

Static analysis result for SHA-256 69184e18507958cf…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1352464eb359b22c9de1f0f639cfc1 SHA-1: 59d04a8dd1f85ec106a823ae18b385b9015e4f25 SHA-256: 69184e18507958cfbda386ffde991e0cdb235fceb1b138332ea5804409a45b5b
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a printable math worksheet. This indicates a phishing or scam attempt, likely using a spearphishing attachment vector. The presence of numerous external links, many pointing to PDF files, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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.ru/wb?keyword=foil%20math%20worksheets%20printable
    • http://files.jpicac.org/uploads/1/3/1/8/131856076/7643686.pdf
    • http://files.plymouthareapolicechoir.com/uploads/1/3/0/7/130775471/vanuvifag-luvibajunoko.pdf
    • http://files.motherhooduncorked.com/uploads/1/3/2/7/132740997/rogoranadajiwusadut.pdf
    • http://files.stawardstation.co.uk/uploads/1/3/0/7/130775565/7007399.pdf
    • http://fizepove.mainauctiongalleries.com/uploads/1/3/2/6/132681464/20ebd71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/nichrome_wire_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/mebexetamilowixofarepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/english_story_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/93069256331.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/morelunapitepinisipude.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/boziza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/edublogs_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/53799740207.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/bazawaruguferidabamax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/kegizapuxasotak.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/56303820836.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/18574935517.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_off00006653.bin
58b656ad7b78f5e9587f74452355f31045bdde137b98936bb38748d7665a1271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6653 5312 bytes
font_01_sfnt_off00007841.bin
aab68bf97cccf22bc5dbe1d676082f121d9544078873734f9cb2499b35729ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7841 10424 bytes

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