Malicious PDF — malware analysis report

Static analysis result for SHA-256 64becb8145b39ca7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba28d8e31bc9bd5604e6ae79e430c87d SHA-1: 0d08a9765c2ce1ec16923e6da889c8d1b9a3eed1 SHA-256: 64becb8145b39ca748f214c1718cf0356533cdcf7f1ee1485cf137ea0ad7fb14
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as educational content. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest a link farm designed to drive traffic to potentially harmful sites. No scripts were extracted, but the primary attack pattern involves luring users to malicious infrastructure.

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=algebra+word+problems+worksheet+with+solutions+pdf
    • http://nojaxeloz.ipuwaifarm.co.nz/uploads/1/3/1/8/131871674/roperoxaj.pdf
    • http://files.clearmomentsupplies.com/uploads/1/3/1/3/131380356/wunube.pdf
    • http://files.grandprixdrivingschool.net/uploads/1/3/1/4/131437418/05f2a2941acf6.pdf
    • http://files.utile-it.com/uploads/1/3/0/7/130739951/ledejazuxe-tuwojewijejufu.pdf
    • http://files.352coaching.com/uploads/1/3/1/4/131453636/tixukef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/25877827496.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/kifomolojologo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/xosesifed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9393/4748/files/rashtriya_khadya_suraksha_adhiniyam_2020_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/49688263658.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/mokimodozuxuvaxudakupe.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/60611184266.pdf
    • https://cdn.shopify.com/s/files/1/0428/4140/7644/files/winokasejezezuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/67109338110.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/13547888426.pdf
    • https://cdn.shopify.com/s/files/1/0432/1122/7300/files/22303779896.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/35062338101.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/rewezegoxafopi.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_off00005f50.bin
d606234968f8a7cf5dcfb1b53c0e05f90699d2b76297f1cc9968135100820c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F50 5740 bytes
font_01_sfnt_off000072bf.bin
2252e580c95b8da93d870d65ae4796363b8ad7a90ce6abe664e1ef3cc8e8fc92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 10892 bytes

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