Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526c726aad5d59e…

MALICIOUS

PDF

34.0 KB Created: 2020-08-19 09:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd77995633e077dba6edd25e7d561640 SHA-1: 19ef910b0fe32434c02a12c11a6405b7de4b1b21 SHA-256: 7526c726aad5d59ebaa8a143b78e61c7f05aa9cbf4dc50f64c44d07cc02552ba
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains references to a game and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=football+revolution+2018+game
    • http://files.kikapoosphynx.com/uploads/1/3/1/3/131380641/silokasifabex.pdf
    • http://files.momwhogivesaflax.com/uploads/1/3/2/8/132815791/9144541.pdf
    • http://jatuzara.curiosityyogaandcoaching.com/uploads/1/3/0/8/130874304/sanititimutapuz-bigexub.pdf
    • http://paraj.baycountrycrabbingsupply.com/uploads/1/3/2/6/132681670/tavuripixedavirefiro.pdf
    • http://files.springstreetanalytical.com/uploads/1/3/1/4/131453288/ff02a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/livro_biotecnologia_industrial_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/lerarerodutipurupelon.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/descargar_cancioneros_para_guitarra_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/12558854937.pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/cantate_domino_elberdin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/md_to.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5829/files/4182591741.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/zozemol.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/5227168576.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/xowatojerikuwidat.pdf
    • https://cdn.shopify.com/s/files/1/0459/6760/5927/files/coolie_no_1_bhojpuri_movie_mp4.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_off0000497b.bin
dd07496afad44678538a322ab285b0ffc345a8c267a2d63a79c599bccfd4ffae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x497B 5500 bytes
font_01_sfnt_off00005c23.bin
110719efa0313940ca361f96e6f3b1167339341a98e6e1b7ca474b9855579014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 8968 bytes

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