Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3bf272bf83a212…

MALICIOUS

PDF

47.8 KB Created: 2020-08-30 20:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd1b377a45b1197732df26112662934 SHA-1: c235105447724693ea2b06175c5c9cad4385d05c SHA-256: 1b3bf272bf83a2126f95f1bb0c9fc13bbea3e5c5987dbc5d1a162168cde93cde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link that, when clicked, redirects to a malicious URL. The document body, though heavily obfuscated, contains the text 'Weekly job timesheet template' and the malicious URL, suggesting a social engineering lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the link leads to known malicious infrastructure.

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=weekly+job+timesheet+template
    • https://static.usrfiles.com/ugd/b8c837_15cea92a4bb34e3a98d6ba609bb3be10.pdf
    • https://static.usrfiles.com/ugd/e4a001_d0c334f79c084cb1aef3146dede4646e.pdf
    • https://static.usrfiles.com/ugd/b8c837_344417b15c694c8ab78c02c761c291cb.pdf
    • https://static.usrfiles.com/ugd/c0fca2_dab86fb908b741cf9adbe67a00c617c1.pdf
    • https://static.usrfiles.com/ugd/cc14e4_8ad17cef81344753a8d3c55f0ac86700.pdf
    • https://static.usrfiles.com/ugd/de65f7_9491643474da4990a21c6e306641c00d.pdf
    • https://static.usrfiles.com/ugd/08fe48_5dd486a5c0b84df1b44e9adf55ea1346.pdf
    • https://static.usrfiles.com/ugd/8b2c09_e3f0512d067e4921b2dd8e59462da17a.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/reporter_amharic_tender.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/57100989713.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xamunodobesezuwenetubaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/nexidir.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/81084358069.pdf
    • https://cdn.shopify.com/s/files/1/0462/4849/3205/files/22121286541.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/tenoxevudefuxanaziruvip.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_off00007d24.bin
805cc0f66a30737fe9edeac4111eb235dc9a7bc83d81fab60cbe69e70af019d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 5360 bytes
font_01_sfnt_off00008f56.bin
ad37355413a0dddbb3fc50ee626b5edb533360fe0d37de89f04ba971378ac63d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 10164 bytes