Malicious PDF — malware analysis report

Static analysis result for SHA-256 8448307dfa439204…

MALICIOUS

PDF

46.7 KB Created: 2020-08-10 06:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f35a0ec346b2b0d2cff5413e715f94 SHA-1: cd9649338521c98c56da78392b39637969a15fbc SHA-256: 8448307dfa439204813e19404bd3c77688a853bf8e8236c91cb4097ceef4314a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with SEO-friendly keywords. The document body, though heavily obfuscated, contains the same keywords and URLs, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link points to a likely spearphishing attachment.

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=angulos+inscritos+en+una+circunferencia+ejercicios+resueltos+pdf
    • http://files.ku-iraqueer.org/uploads/1/3/1/4/131437056/vaderirixum_pixigozulinu_sekivujeb_tedevaxovilat.pdf
    • http://files.blancheguernsey.com/uploads/1/3/0/8/130813557/guvadafozokobakakisu.pdf
    • http://files.wallaceclassroom.com/uploads/1/3/0/7/130775760/e814df96db85.pdf
    • http://vixupo.lagunaniguelcarpetcleaning.net/uploads/1/3/0/9/130969772/4070969.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/4370719436.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/75167321193.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/microelectronic_circuits_7th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/64747695417.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/78255094166.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/gobudefoxifoxin.pdf
    • https://cdn.shopify.com/s/files/1/0448/1787/5110/files/bronkopneumonia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/56189448888.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/rikebuzebifupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nerukobufazubaruvurasurax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/foxoruwozepinevoru.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_off00006084.bin
5cbedcda38578e3de563c3337e923fa6734d4cc2cd8e6155bcf395d6c53fc43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 2208 bytes
font_01_sfnt_off00006a7f.bin
102a73c33513f75b3a2f3eb36a2dbeabc4ae27f0faa6cae143a262648fd8bfa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5388 bytes
font_02_sfnt_off00007cf5.bin
65c67d971d9361574cd9a75382beb3a21098bb4f4dbe7a25495ef0228bd1a817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF5 14960 bytes

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