Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffdd23480735f0c…

MALICIOUS

PDF

45.1 KB Created: 2020-08-04 11:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e5f69dd0d3becc216199dccf2fb0d2 SHA-1: 2bc8d1428ed351fda44c0b2eb0012387becf2d57 SHA-256: 0ffdd23480735f0cbbe7dc36d689be2c23afdac0fb44e64c53eef47c90a74327
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely a phishing lure to redirect users to malicious content.

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=robotica+pdf+gratis
    • http://files.carrerastacos.com/uploads/1/3/0/7/130775690/jazoperidogavifafaso.pdf
    • http://files.coolmountainkids.com/uploads/1/3/0/7/130739076/gerufu-difegusare-sarulusezazu.pdf
    • http://files.myearlylearningbox.com/uploads/1/3/0/8/130814115/2035034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3083/0494/files/93663464436.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/30115162172.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/13549696753.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/7715946286.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/gafawazufefisamumawid.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/pejanesorusegujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/13733690040.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/20539237769.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/native_american_culture_and_traditions.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/39254410904.pdf
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/1302916049.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_off00006506.bin
fe2edbf6f30561601c9f172272b5274367db198d57005b254af71bc7efa9b15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 5000 bytes
font_01_sfnt_off0000760f.bin
537d68f600464ffa7693dc047a158e5b426494f95926ab5ce40422be063e1ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 10512 bytes
font_02_sfnt_off000099ba.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BA 4324 bytes

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