Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d8354341f6fc9d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-24 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7141e871f7195a9b8adf9914f8de6b8 SHA-1: b32733baa8ff3def500f0e10da46819d007c7c17 SHA-256: 93d8354341f6fc9dc97254625e9a246f7651dcb190fe80f9ef764403fa18d309
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious URL being a redirector. The document body, though heavily corrupted, contains the text 'Ascending and descending worksheet for grade 5' and the malicious URL, suggesting a lure to disguise the malicious redirection. The ML classifier strongly indicated maliciousness.

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/pify?keyword=ascending+and+descending+worksheet+for+grade+5
    • http://files.pitabilities.com/uploads/1/3/0/9/130969313/5206329.pdf
    • http://files.bananatreeroots.com/uploads/1/3/0/8/130873781/gefapubele.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/manual_aromaterapia.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/podelapebaruj.pdf
    • https://cdn.shopify.com/s/files/1/0450/6897/6291/files/alice_miller_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/concept_of_economic_planning.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2508/files/thank_you_letter_template_for_elementary_students.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1350/files/32926112470.pdf
    • https://cdn.shopify.com/s/files/1/0435/8419/2675/files/windows_8._1_64_bit_activated.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/62431174479.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_off00004790.bin
5091bee3926a4afe5dd4aa857a000e5357da5d85613cfcff57dba6c62b667cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4790 5520 bytes
font_01_sfnt_off00005a60.bin
d5d77fdef209eb81861b3a9670cf17fb5809eeb0be0cbda8c1103f14871002a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A60 10020 bytes

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