Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5dcb08e3214040…

MALICIOUS

PDF

43.9 KB Created: 2020-08-05 12:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac84572bae2485c860906c7703d119b SHA-1: 16b549226a8317856741d496b72084d9ec8536bb SHA-256: 7f5dcb08e32140401726ec6fcc64f06e843a078f5c7898f078ee12701de49f32
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, many hosted on Shopify. One of the primary links, 'https://ttraff.com/pify?keyword=early+civilizations+worksheets+pdf', is identified as a malicious redirector. This suggests the document's purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. 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/pify?keyword=early+civilizations+worksheets+pdf
    • http://files.bhsvikingtheatre.com/uploads/1/3/1/4/131408100/5059474.pdf
    • http://winovimu.groovevinerecords.com/uploads/1/3/0/7/130738993/7acb3a66.pdf
    • http://sasiwe.bodyvelocitybootcamp.com/uploads/1/3/2/6/132682787/dovokezaboguxa.pdf
    • http://files.shsu-xa.com/uploads/1/3/0/9/130969824/sasap.pdf
    • http://files.theroyalapartment.com/uploads/1/3/2/3/132302732/5043949.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/summarizing_and_paraphrasing_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/raxojekugamirorofopowome.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/misopasofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/69041296114.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/56572085863.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/can_you_get_a_free_teamspeak_server.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/nolus.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/mopuperepafasunofuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/degojobiwazopuxenanizixiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0830/1989/files/fijivupuwodipebituwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/60210761811.pdf
    • https://cdn.shopify.com/s/files/1/0434/1068/6113/files/vevowewevujomerisapode.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_off00005fd7.bin
42b4b81cd260be62fa79aaa7dcb026ee1c083478c43103940aa8fb873e811bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 5356 bytes
font_01_sfnt_off00007227.bin
862251e350104cefc916a246abd42bd7401cb4993937133a8da0fc86cd11b7f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7227 9996 bytes
font_02_sfnt_off0000946d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946D 4324 bytes

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