Malicious PDF — malware analysis report

Static analysis result for SHA-256 835568f35779b85d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 21:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44fb49b4eb7e375a664966f7ec192db SHA-1: a988d69f85137c990b801e0b746ccd10c72dd008 SHA-256: 835568f35779b85d68c3824fe810af4ac4ecd02f060aac88c9ef80c9b4217b5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed to manipulate search engine results. One of the primary links, 'https://ttraff.com/pify?keyword=linux+administration+pdf+notes', is identified as a malicious redirector. This suggests the document's purpose is to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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=linux+administration+pdf+notes
    • http://files.heathandhaveringurc.co.uk/uploads/1/3/1/6/131606407/roweziduk.pdf
    • http://files.belmonteestates.org/uploads/1/3/2/6/132682851/pudulovonejiv.pdf
    • http://files.jeresuontausta.com/uploads/1/3/1/4/131453540/084d661.pdf
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdf
    • http://files.gummystudios.com/uploads/1/3/1/4/131483317/b8b037c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0777/7700/files/tosarowusebewar.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/71707528910.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/converting_to_word_without_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/domukivik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/56546597654.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/zebugikixuxexudet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/10953858352.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/xawamuwebax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/94501588454.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/63382521059.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/61254601067.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/lajisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/beloju.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a70.bin
638af0299c048f6671f6b4df2724b98ba3ad7ef79b50eb47ef91abe3966d065e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A70 5164 bytes
font_01_sfnt_off00007bf4.bin
34701af7286f45e81e36a61cd5672c626a8fc25ecdf06b34762b263e4a82f272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF4 10700 bytes

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