Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a32668b30cfd8f8…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 14:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b59a2f1b02e3eb3b793bb540f4cdb42 SHA-1: 1b85bddf62130bfb7b03086e001c79050187ae7a SHA-256: 5a32668b30cfd8f8212e03d553443db1ee7fc6b418563c633406d473414e329b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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/wix?keyword=el+arte+de+cautivar+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0ff8e9464b7e449f957abea3bc35e932.pdf
    • https://static.usrfiles.com/ugd/b8c837_53dc5c50d03d4dca8048a1457711c668.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8679ef925f6435684dc6b9c5758c7d9.pdf
    • https://static.usrfiles.com/ugd/362633_5271fdd8e1474c199414c7198adb5a6e.pdf
    • https://static.usrfiles.com/ugd/d5415a_ef85ca68b1d04b71807f4a5076508fe4.pdf
    • https://static.usrfiles.com/ugd/b8c837_35695968fed741b7abf77f63de221c93.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/munoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/fixelasigepadew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/time_management_worksheet_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/lekuzapevozobizumum.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/pejanodelusetodajep.pdf
    • https://static.usrfiles.com/ugd/80c1db_adfb18e3b5be43c9b83616da98ff6c70.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b8d4db34fb94d73a78dfc389e551d89.pdf
    • https://static.usrfiles.com/ugd/d17951_206895dc51c543b7948d39792daa394e.pdf
    • https://static.usrfiles.com/ugd/a44510_8ec023b191404144bb8dec002afcbbff.pdf
    • https://static.usrfiles.com/ugd/b8c837_356eaac9d8654425a136f3fe050ab2d3.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_off00006640.bin
3425556f17138829a96492b65922d34d83391d63e98c8b2c5f17bda42bd6625c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 4988 bytes
font_01_sfnt_off0000774d.bin
3d6005d619ee57ade550e2add97cec51ef44a2fa15af29320727c37e400d13a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 10772 bytes