Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c88e984bf64e0…

MALICIOUS

PDF

34.3 KB Created: 2020-08-30 03:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d331957a5e53d94f2e897f1e704bee1a SHA-1: accc4a40999b6f14a41103773dbeb37340337c63 SHA-256: d48c88e984bf64e02645bb4d6bf2da1077332b8156583a71e05dfd870a7fa02c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier as malicious and contains a high number of embedded links. One of these links, 'https://ttraff.ru/wix?keyword=radiohead+ill+wind+download', points to known malicious redirector infrastructure. The document body contains a mix of seemingly random characters and URLs, suggesting it is designed to host a link farm or redirect users. The presence of numerous Shopify URLs, while many are benign, contributes to the overall link farm characteristic.

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.ru/wix?keyword=radiohead+ill+wind+download
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/82148188038.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/giwudejitizofal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/minezole.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/xedugebew.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/you_and_me_lifehouse_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/hanuman_chalisa_lyrics_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/nuzufovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/mudupuxugazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5919/0689/files/minimum_lot_size_sap_report.pdf
    • https://cdn.shopify.com/s/files/1/0454/5308/2782/files/rocket_propulsion_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/xakimomivox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/78603083879.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1691/files/24026944695.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/5990/files/cdc_yeast_infection_fact_sheet.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_off00004a68.bin
322b3e586b0deb8f1369a7957460958bc3527bf6362ad12d8ee0780d4e7ef53f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A68 4736 bytes
font_01_sfnt_off00005a8d.bin
c8a9ee7238fddbef44edc94da7da8587d8ac124ab05ba3270b49f82dc49d18c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8D 9980 bytes