Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f258cc174ce1d6…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 13:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8052ddf2ef4ff5a468324e41d8a2f94 SHA-1: 76ae97cadff12de899b91dfc16b44012b629c0ad SHA-256: 52f258cc174ce1d6d83a6d4270383a8a2c2a249d0c92ba5fd195b3d6280f6d93
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=lamictal+drug+information+sheet', suggesting a lure to a fake information page. The ML classifier strongly supports the malicious nature of this PDF.

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=lamictal+drug+information+sheet
    • https://static.usrfiles.com/ugd/ae059d_d18b990c1e3c439b8cfc731d9ac1542e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9269d17b71a4edd87cb2a3594e3f91f.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_75bd07945d99465e8195346586735b87.pdf
    • https://static.usrfiles.com/ugd/52b593_241dbfcb6d994007909467d53cd50b65.pdf
    • https://static.usrfiles.com/ugd/fbccce_dd6587d623d74249b281d3b787590198.pdf
    • https://static.usrfiles.com/ugd/913720_63e07ece18bb4786958eb1fa20f541fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d41640d3c184fca8f35edf71921ecee.pdf
    • https://static.usrfiles.com/ugd/fb5067_c57c20c87787461c8262260c7b34e67d.pdf
    • https://static.usrfiles.com/ugd/89c6ad_69fab1cc25bf468eb6b594573a47a0d7.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/917270589.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/wituronosukubebofolabomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/pilurinadoruwe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/free_printable_happy_birthday_banner_templates.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_225b9dbeb52548c9b9580a984dc299e2.pdf
    • https://static.usrfiles.com/ugd/68ec51_608996c74cbe4001a1c0830ff37b4e56.pdf
    • https://static.usrfiles.com/ugd/defcb2_5044590948a04832827478ebd8cfac9e.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006720.bin
9aa1b5320a6dd1226a395a41cc90f06b80453058d3ef2e0a4491ff9465e09152
pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 5376 bytes
font_01_sfnt_off00007942.bin
a873a8aacc4b0a3ed643f0ff7cbac52086356e9f22feeac00320a29b361445e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7942 10068 bytes