Malicious PDF — malware analysis report

Static analysis result for SHA-256 1430478f9d6bdbf0…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 20:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c1bc6f40f707942b607eda85d3c8a9 SHA-1: 29717de69f0cc18227a5872301da01b97a697058 SHA-256: 1430478f9d6bdbf0a3f5c597a4050ba8842d98756e07d36a5c7e87a735c1e932
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, suggesting an attempt to direct users to harmful content. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a link farm strategy, likely for SEO poisoning or to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.cc/pify?keyword=literary+devices+pdf+high+school
    • http://tazivox.yashbangera.com/uploads/1/3/1/6/131637649/pafasipifufola_zivuziben.pdf
    • http://files.authenticatex.com/uploads/1/3/0/9/130969172/91ebffe673.pdf
    • http://gesivov.lflplatform.net/uploads/1/3/0/7/130776262/berebigowub.pdf
    • http://geseda.heatonfeetfootwear.net/uploads/1/3/0/7/130738732/fubigu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/wapeniv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/87530861362.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/kajepitog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/raninidonikeme.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/76253880283.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/bokelupuzonavimedove.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/alimentos_transgenicos_ventajas_y_desventajas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/16893071437.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/fusurezobusegiwapituk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/67509118494.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/center_in_markdown.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9030/files/eleemosynary_play_script.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_off00006bce.bin
d9ab8a1b4ebd24f6f42442f3965f16b71632ac1314d4e1254f0dd5ea6c763e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCE 5520 bytes
font_01_sfnt_off00007ea0.bin
756258b2cdcf5ac01c2111111b590aa4ff96d3876c5b03e8bf77c561e9480091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA0 9932 bytes

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