Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aca82567776de5…

MALICIOUS

PDF

37.3 KB Created: 2020-08-18 22:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d923670a3d4ae25418d438ef9d8d7786 SHA-1: 3bd9366b65f6d1eefdc79d53d6f4fe4b145634a3 SHA-256: 28aca82567776de598c5e66cd524731be75be957cc4de0eb7c40fa80b193ba12
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, including a primary suspicious URL that redirects to a page with a keyword related to a manual, likely a lure. The presence of a large number of embedded links, many pointing to Shopify domains but also to other suspicious domains, suggests a broad distribution effort.

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/pify?keyword=aqualung+i550+manual
    • http://files.michaeljmorris.co/uploads/1/3/1/1/131164351/286654.pdf
    • http://dotitike.thehungrydreamer.com/uploads/1/3/0/7/130776474/gabaposelite_naraduzawanotix_sajonawotago.pdf
    • http://files.roadrangersbassclub.com/uploads/1/3/0/7/130775850/9594318.pdf
    • http://files.goldilocksvalves.com/uploads/1/3/2/7/132741130/9872031.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/98737764282.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/elder_chaos_druid.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/3776547188.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/blank_map_of_african_countries.pdf
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/towudatagemiwor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/87185130238.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/39616321539.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/18471450848.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/aldi_annual_report_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/webagofajodasirofidif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/70558992189.pdf
    • https://cdn.shopify.com/s/files/1/0432/2869/2643/files/83935789470.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/15623236415.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_off00005521.bin
b51fcd8f34fa9f5ec3f5ee6caafb961709631275d2c7bef00a33607e2f5ff00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5521 5112 bytes
font_01_sfnt_off0000666f.bin
7068e60b4210e08fc04ae808574b38886fae09b7b8b9a9cf14643e752905be50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 9936 bytes

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