Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0e950c8c24718e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 21:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c762925bdd04b6a11066f1851bdd95f9 SHA-1: c49405d926c592aa8dacdb027e83598447c26733 SHA-256: eb0e950c8c24718ea9ebc95e291658fc09abb9fb93f88e4dbbf29fcdb1fedde9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting it is the primary lure. The presence of numerous other links, many hosted on Shopify, points to a link farm strategy, likely for SEO poisoning or distributing malicious content. No scripts were extracted from this sample.

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=river+flows+in+you+virtual+piano
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/nutexapalunupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4669/files/suderubedikugex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/sotokitotajesosaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/81424199749.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb74411209b34f72a253845f1bf135b1.pdf
    • https://cdn.shopify.com/s/files/1/0461/7663/2986/files/coccidioidomycosis_idsa_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/8211/1381/files/prenuptial_agreement_sample_florida.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/72785657978.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/personal_pronouns_worksheet_grade_6.pdf
    • https://static.usrfiles.com/ugd/b8c837_dccc252bc9b54ef0aefd27ea420dbcd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_16a197206b3d42e798e881b61fe74dd9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ff.bin
b578de7c357468e5e831d9348cffd03cb4c7aceadf8b653226a7946c76b1d6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x48FF 5040 bytes
font_01_sfnt_off00005a4f.bin
a4c44cb3968b6668132fd09d95c69bbea261dd404e8d9a67cdfc3b1e4395a582
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4F 13788 bytes
font_02_sfnt_off000085fa.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x85FA 4324 bytes