Malicious PDF — malware analysis report

Static analysis result for SHA-256 2742b57fb457b79e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-24 05:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ca9106fd031bd5ff37c62fffab59ed SHA-1: 0a1846d6dbb23d60948db6a908ee4209e921c93e SHA-256: 2742b57fb457b79e1f0a95e7ccfe5c2dd07a65a399b0e2316970cd20c2ec7a74
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link, 'https://ttraff.cc/pify?keyword=caida+libre+pdf+unam', is flagged as a redirector to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains many of the extracted URLs, suggesting a content-luring or redirection mechanism.

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.cc/pify?keyword=caida+libre+pdf+unam
    • http://files.antiquestauranga.co.nz/uploads/1/3/1/0/131070146/93e045.pdf
    • http://kuwed.fcsautomation.org/uploads/1/3/0/8/130814935/zexakiwonotovalif.pdf
    • http://ruvepe.thelytlebarn.shop/uploads/1/3/1/0/131070306/7267475.pdf
    • http://butej.raynecitycourt.org/uploads/1/3/0/7/130739173/b913a240fc4a3.pdf
    • http://wabefe.nnft.ca/uploads/1/3/1/6/131606666/5119180.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/45126979244.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/lodinog.pdf
    • https://cdn.shopify.com/s/files/1/0432/5854/4292/files/piwunapojozedapivaroxok.pdf
    • https://cdn.shopify.com/s/files/1/0466/2686/5317/files/vuwojofiwafutogu.pdf
    • https://cdn.shopify.com/s/files/1/0459/2081/3205/files/alberto_moravia_boredom.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/72194471755.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/52771891453.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/xisepus.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/nemumusiwejiritefudi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6616/9246/files/59394265292.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/jibokokipidibomireriz.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_off00005add.bin
2adce219870b9ec085d978a491e9dbef3c56ec6ebcaea9b1e0e2f54159ef8d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 4864 bytes
font_01_sfnt_off00006b39.bin
9bc219f0b18a8399db49a54f104bae8979913ca8c0b8ec4a6ddab9e3ca327e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 11648 bytes
font_02_sfnt_off0000910e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910E 4324 bytes

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