Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3d488d63e7a13…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 15:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148d135cd6ce3f4f07165e345b80394c SHA-1: 8c6a1529d86c5c734b4a351f6b07066f289c2386 SHA-256: b9e3d488d63e7a13749e429eeb313c2955bc92cfb4eaaa95217a8a538646a49c
152 Risk Score

Malware Insights

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

The PDF contains a high number of external links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the PDF's primary purpose is to lure users to this external resource, likely for phishing or malware distribution.

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.cc/pify?keyword=reactive+hypoglycemia+diet+pdf
    • http://puzivejak.gravitysuccess.com/uploads/1/3/0/9/130968926/pajuga.pdf
    • http://zewufusaf.kolayoga.com/uploads/1/3/0/7/130776485/875a4b.pdf
    • http://files.hamiltonpiano.org/uploads/1/3/0/9/130970023/wumokerojetutavome.pdf
    • http://files.beasleyceramics.com/uploads/1/3/1/4/131409210/5400049.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/83233562954.pdf
    • https://cdn.shopify.com/s/files/1/0428/9393/4748/files/byod_policy_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/basel_ii_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/limavofo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3950/4022/files/hacks_for_clicker_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/72574817047.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/calculus_stewart_8th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/xosanabifudutukal.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/70522522795.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_off00006a36.bin
907f15051376af38470a1ee13bfac12c10a719d5843c890c9625df43ed87cf7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 5148 bytes
font_01_sfnt_off00007bd7.bin
d4dc6b4a875c3ad8890eb9cbb814e71e0d2f734cc9934fb6f8a3b430a662bd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD7 10060 bytes
font_02_sfnt_off00009e54.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E54 4324 bytes