Malicious PDF — malware analysis report

Static analysis result for SHA-256 1240c3d631dea198…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 05:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5db3620094f6e1d4f6417ff4c0a6579 SHA-1: 637f00dbf0a33a27954cbe12c59f6ff1893666fb SHA-256: 1240c3d631dea198c5d986a98f3a01ec3573cbe749d3e58fac531b0bdbe5ba85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links, many of which are part of a link farm. One prominent URL, 'https://ttraff.ru/wix?keyword=suyanne+quevedo+na+praia+n%25C3%25A3o+mar', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution.

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=suyanne+quevedo+na+praia+n%25C3%25A3o+mar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/free_guided_progressive_muscle_relaxation.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/36201662320.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/husqvarna_445_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/92832266217.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/fuvewezilabomewive.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/12695368383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/formato_de_acta_constitutiva_de_una_empresa_para_llenar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/rexolelotawatigorofitoka.pdf
    • https://static.usrfiles.com/ugd/4cf28d_2d154de419e344e6891950989719bcd3.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b650ed77bf354bb787885619295c71b5.pdf
    • https://static.usrfiles.com/ugd/a382ee_fdbdf74490b24aa485521856956470f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78f471f79da4167b0a7e9953e87252a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a2ab1049a94d1a8a39eef67ba22b0b.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/puxudokomiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/daylight_transportation_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/xibexitidudejir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dec.bin
302e1cfaa4d0b2d41ee0949a28b7e9a2eafbaac785fb5ddc9c456b8ae4c02930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 5404 bytes
font_01_sfnt_off00006f96.bin
8e0e6a6d70cec98575da21b2bfe6e0c4d486c88593ec65dd5959986e51336576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F96 13144 bytes
font_02_sfnt_off00009733.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9733 4324 bytes

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