Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fa072b5c17ae68…

MALICIOUS

PDF

46.8 KB Created: 2020-08-10 10:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c67e0f45b97e707682b0c8645e1308 SHA-1: 6b3aca339c0ee098b04a5ef624e573874105aa7b SHA-256: 65fa072b5c17ae684cd7883cc2527c26de143826b595a0b8ebde856e81f6a5b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Futurelearn certificate of achievement pdf' and includes the malicious URL. This suggests a phishing or scam attempt, likely using the certificate lure to encourage users to click on the malicious link.

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.ru/pify?keyword=futurelearn+certificate+of+achievement+pdf
    • http://fuxuja.greensboromedicalsociety.com/uploads/1/3/1/4/131407552/f4cee.pdf
    • http://files.luisimera.com/uploads/1/3/0/9/130969438/diparofa.pdf
    • http://bifujet.anetagrygarova.com/uploads/1/3/0/7/130776445/semet.pdf
    • http://files.firebirdnewzeal.org/uploads/1/3/1/6/131606248/854963.pdf
    • http://kenufavad.plumasarts.com/uploads/1/3/2/8/132814930/cbfb69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/wokevol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/emoji_show_me_the_money.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/sariwedewutokow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/vebonuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/mushroom_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/wesabekutekimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/vanozezuzimipelagesas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/98656028707.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/vegosutep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/mizixaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/netepokixetoxafakojok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/86124222589.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_off000078dc.bin
d9711dd2f64e4ee7a27842a8691b17f196116a86703136bf6f2bf0f36095056b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DC 5232 bytes
font_01_sfnt_off00008a87.bin
770710d2210b52470c284d2fa03cd9a4f37898a66f81a47a884179a03e19bcad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 10340 bytes

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