Malicious PDF — malware analysis report

Static analysis result for SHA-256 416d7897fb207fad…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 12:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26cb9b04e718f2b212ae0c06862af1d4 SHA-1: ca1ab787f2da217b8b711a39204474a6a8681de1 SHA-256: 416d7897fb207fad51c35777c5d32a0b0c4cb2bb10b24c793d61bee69e3e27b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a critical heuristic firing for a PDF redirector link pointing to ttraff.com. Additionally, another critical heuristic detected a PDF link farm with 17 external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body contains text related to calligraphy and the wkhtmltopdf application, but the primary malicious activity appears to be the extensive list of embedded URLs, likely serving as a link farm for SEO spam or redirecting to malicious sites.

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.com/wix?keyword=atividades+de+caligrafia+alfabeto
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_74fc5a1685cb45c594a89ea55cf96e93.pdf
    • https://static.usrfiles.com/ugd/b8c837_57da1a70ffb54bcdb5b94610ada5d0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_d345e268873f4e8cafee38c42d1886bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_042c7a517b0643419b96d90e413b3267.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/40341352770.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/taxezevevodax.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6663/files/barron_s_sat_subject_test_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/73457419095.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/53826692447.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/51512692752.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/1807883584.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/buzusokewaxodop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/kawitokipulekev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/analise_sintatica_e_morfologica_exercicios.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/holy_bible_reina_valera_1960_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/wuxomibemolinak.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f82.bin
b2f42e482d7963fb441cc93693f4718441764b6703d80668819591b5b466cccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F82 5380 bytes
font_01_sfnt_off000071db.bin
57a0d29812cc962f015fa79397565281740a17e7c7a96bb99bf61e0e948a0e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 12376 bytes

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