Malicious PDF — malware analysis report

Static analysis result for SHA-256 0416c1a6fb27a218…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 07:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd9b0817e6d974b08a4b45cde776f247 SHA-1: e96a1e36068b6a025adc7d9d56f4c8e7b1437e43 SHA-256: 0416c1a6fb27a2181a441a2fd10c2d8146d27c6b762f62c8d303b644546880a6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links and the link farm tactic are strong indicators of a phishing or SEO-based malicious campaign.

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/pify?keyword=b+a+m+s+long+form+marathi
    • http://torezo.gloriazachgo.com/uploads/1/3/0/7/130776021/1ba9ab6a8fb.pdf
    • http://nowozikux.totsandco.org/uploads/1/3/1/3/131384709/xobijatasozev_lagig_tujorol_puriwa.pdf
    • http://files.brightyellowministries.com/uploads/1/3/0/9/130969573/1564683.pdf
    • http://pifojepen.platnymscloset.com/uploads/1/3/1/4/131438003/4506738.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/74654318431.pdf
    • https://cdn.shopify.com/s/files/1/0452/5621/2640/files/carcinomatosis_peritoneal_causas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/mekonuredupitud.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/tivutalojilapoxupukosafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/94101459214.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/lung_abscess_bts_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/callan_method_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/simple_java_projects_with_source_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/libro_bacteriologia_clinica.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/obras_de_brazao_mazula.pdf
    • https://cdn.shopify.com/s/files/1/0449/0631/5943/files/20229315009.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/bloomberg_businessweek_magazine.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_off00005e67.bin
50198cd28e35659949d93f9837c8af9d8d7f16735891526d0ea0741290bbcb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 5232 bytes
font_01_sfnt_off00007004.bin
f90547ee44851fa4c202a6705d000ab854f222de9108513550b8d8164e70c407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7004 10176 bytes

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