Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58773183a312edb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8abb15f9cd1cb13f55ad4f50e11493e SHA-1: 5c2af1d23491139188aeb8067d0b730a80b7a89d SHA-256: a58773183a312edb47ef0a7f77c878d60af56578b53a9562d521fa18082e03af
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors and part of a link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=libro+canales+de+distribucion+y+logistica+pdf, is designed to lure users into clicking through to further malicious content. The document body, though heavily obfuscated, contains references to the lure text and the malicious URL, reinforcing the social engineering aspect.

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=libro+canales+de+distribucion+y+logistica+pdf
    • http://files.laurenratcliffe.com/uploads/1/3/1/3/131380445/fa6700ee.pdf
    • http://files.integrativetherapiesandwellness.com/uploads/1/3/0/7/130740563/7012993.pdf
    • http://sewejezig.oliviajtrees.com/uploads/1/3/1/6/131637136/0289e6.pdf
    • http://files.han1image.com/uploads/1/3/0/7/130776326/dabul_lezaxe_bedodadupa_vubevexujuzuji.pdf
    • http://files.scottschick.com/uploads/1/3/0/9/130970022/fatoxanami_sewegajegunen_tasuzin_fufufuzifixebaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/gozibu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/75252585937.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/34885403969.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/36743065705.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/46670608750.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/paruk.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/18392885401.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/sikigularufofalom.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3050/files/xuwepitopugilisikije.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/javascript_save_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.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_off00006535.bin
e0c73390899a89376931a50c396e95b6431ded8a0a9901ec13b5c492ca3379bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 5504 bytes
font_01_sfnt_off00007808.bin
52cc35293df4f9d5839bf3afd7f3165f6fa25e9d8393223691be607ff3fb3b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x7808 11268 bytes