Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1f79b2bb6d86df…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 09:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd749c184d20c1057752bb1ab710ef1f SHA-1: d36038ec2986198acc0db0e285095dcbc4964c55 SHA-256: 6c1f79b2bb6d86dfc3a603602dee1f24798a6fff0cf944c34167081d63b57086
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, indicating an attempt to lure users to malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and appears to be a deceptive lure. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or scam attempt.

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/wix?keyword=quiubole+para+mujeres+gratis+complet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/he_s_going_the_distance_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/high_jump_bloodstained.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/duwobozulagafavos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/luguxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/factoring_polynomials_review_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ec49a0ee4824ad0905838b2e0b8662a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad68fca67e90411aa6ce471b0df2e011.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bcc84c9e6354546820c06fd96048e04.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cb4d3dc85054b18a0d286c6c6892292.pdf
    • https://static.usrfiles.com/ugd/b8c837_28acea3de6f24adc96ab9e276cec3be0.pdf
    • https://static.usrfiles.com/ugd/b8c837_439e1fefe93744659e27b060ebe7e964.pdf
    • https://static.usrfiles.com/ugd/b8c837_29e836ac4b7343c7bd9a3b850c249507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/analysing_architecture_by_simon_unwin.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055b8.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B8 6440 bytes
font_01_sfnt_off000065ac.bin
e2d820adce4e4479f7afa46cb1abe3b329a365ce394d56135d2667f449557317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 5532 bytes
font_02_sfnt_off0000785b.bin
cf018ba6d236a279c4c58bb511e0189ff8b3adee082b099ac1e4b1a51970df7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 14940 bytes

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