Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8506705029ff182…

MALICIOUS

PDF

37.7 KB Created: 2020-09-02 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c010ff4bfb26a92e6bb1c2750fdcfe SHA-1: d048a8dbb19533df1594c98aa81b3258c52eef67 SHA-256: a8506705029ff1822164e3858a637b3ba4ee2de2e3de1f5fded42c49fed78879
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/pify?keyword=bresser+skylux+el+manual' which is likely used to redirect the user to a malicious site. The presence of numerous Shopify-hosted PDF links suggests an attempt to obscure the final malicious destination through a link farm.

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.me/pify?keyword=bresser+skylux+el+manual
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/jewaravulalurej.pdf
    • https://cdn.shopify.com/s/files/1/0435/7780/2911/files/jofenufurumotisogisesabew.pdf
    • https://cdn.shopify.com/s/files/1/0463/0393/6669/files/anarkali_film_sufi_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/early_settlement_of_australia_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/nomireretumo.pdf
    • https://static.usrfiles.com/ugd/362633_a994cc5cf8a44052914c4b07b0ceba7a.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_5751e5eefe4c46c795dc17a55ef588b4.pdf
    • https://static.usrfiles.com/ugd/8c0e65_7cd5e4da8b2d42aa9e4ec48ec8b48fff.pdf
    • https://static.usrfiles.com/ugd/0d9a50_04b4b8be3a4e46dca13a8be5f6dd337c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/xegap.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/29312293590.pdf
    • https://cdn.shopify.com/s/files/1/0463/1527/4397/files/ancient_egypt_webquest_answer_key_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/google_chrome_stuck_at_100.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://static.usrfiles.com/ugd/f0e51d_2c7b0e817f2c4154bd2bd254db66b3a1.pdf
    • https://static.usrfiles.com/ugd/4d6844_da9d629f8aa54b22918296f371f89abc.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_d3fd438a2d444d52ab20522a39bb6943.pdf
    • https://static.usrfiles.com/ugd/b8c837_84d57bfd287a4c5ab69d3ef4287faab9.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_off00005630.bin
345b03ad6e7b2dfd24d6df2a9ec3c397db4b85badebca71532f35927a7b373a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5630 5116 bytes
font_01_sfnt_off00006788.bin
52fd95547d43929f44accbe05a1b882a4b159cc38346044672175fb69a43fe2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 10028 bytes

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