Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566fbb35ca90511…

MALICIOUS

PDF

49.3 KB Created: 2020-08-30 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc33fa502ad8a1c254275bb2720e92c6 SHA-1: 393b37a09de8d3ec6ac31dc0a6d44ad14c8299b7 SHA-256: 1566fbb35ca9051120570f97261a656bf6e2c196875f86745871875503b8ce6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier 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.com/wix?keyword=senran+kagura+hanabi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/riwofazol.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/tozizixebelupidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/tinotazaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/ruxutegejejoji.pdf
    • https://static.usrfiles.com/ugd/72b0e7_580420e2c92746878b67fc7a016d4816.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/dhl_division_del_norte.pdf
    • https://cdn.shopify.com/s/files/1/0436/0264/1059/files/musugubige.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/dukara.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/byomkesh_bakshi_series_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5604d5f2d7741efba6f247756932ddc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://static.usrfiles.com/ugd/88a84f_564ee42e88e94247bbb7cc524c7ac0b5.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_d25eb68ea7d8471b849bd6bd79ce90a5.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_off000068a5.bin
4f11fcc2abfad90f88b84cee61a3233a079dba3d748a118a2e251ff491ca57e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 6444 bytes
font_01_sfnt_off00007e71.bin
c1562c7de944ce30f4ab399c9dce8bb75f349133028e0216c2c24a78593fdb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 5044 bytes
font_02_sfnt_off00008f94.bin
c5ae20a4ab633a50bd38bd6b6002c7c5fbece755502387270d4c7548e3a46cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F94 12120 bytes