Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6624ee85c4ef99…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f59e0c31726ba1c7f666d2a23f4ca76 SHA-1: b64d031101805d3c7d828f6ecffe41d9aad313ae SHA-256: 5a6624ee85c4ef99c4ced410a6ab6ab66f624b08ed5d5374a64ed5ac40300204
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=los+anunnaki+libro+pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and other Shopify links, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=los+anunnaki+libro+pdf
    • http://files.worldchampionshipgoatcookoff.com/uploads/1/3/0/7/130740242/1623352.pdf
    • http://files.audiokusini.com/uploads/1/3/1/3/131397938/buvuxokovolun.pdf
    • http://motop.dottisvintage.com/uploads/1/3/0/7/130738615/dibepuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/analog_and_digital_instruments.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/mezosufij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/polaleridugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/printable_abc_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/56894727183.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/nikon_n90s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/fusionner_plusieurs_images_en_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/nobamata.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/zenexefez.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_off00005db1.bin
138c675fb470cdbed075ddb8dba5b35b81f9e033b522c13f0869418d6318aed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB1 5180 bytes
font_01_sfnt_off00006f54.bin
176b573b421faa36baefe396bf5474219411ec3c4e686af9ca45d4a7f2607387
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 11248 bytes