Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae767d39544e21d7…

MALICIOUS

PDF

45.4 KB Created: 2020-08-11 18:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b5e50da433958257b68bb2bb421258b SHA-1: 67a2bc02f9202a87cdf47da58374296160be74e3 SHA-256: ae767d39544e21d782c9188e7f6f3dcb89673c751e584d3b1b62352c71a70c82
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'Cardiopatias congenitas definicion pdf' and includes the malicious URL, suggesting a lure to potentially malicious content or a link farm for SEO manipulation.

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=cardiopatias+congenitas+definicion+pdf
    • http://files.destyinvestments.com/uploads/1/3/2/6/132683087/5983337.pdf
    • http://files.themudhome.com/uploads/1/3/1/4/131408280/wuwakatal.pdf
    • http://files.publicgardendesign.com/uploads/1/3/1/4/131407138/b4397b3af.pdf
    • http://files.lisapellingdietitian.com/uploads/1/3/1/0/131070866/wuruwebiji_getoz_sokatedafani_semolitifasap.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2988/files/spring_webflux_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6601/files/apprendre_l_anglais_commercial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/46949301976.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/notetutus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9403/9975/files/toastmasters_competent_communicator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/3412/2139/files/android_developer_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/87391127852.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6048/files/95249874015.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/pasofakuwuvozuzepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/beretta_px4_storm_full_size_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/82701662721.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_off000072cd.bin
eec026c5cead3835ae24b32c58ea8b49c11a083fb083ceffb4c5f9f0e57d516d
pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 5196 bytes
font_01_sfnt_off0000848b.bin
a70a31d9107347ffde1ef8f83e3142f9cdb74a6424320b13286668d5ba6c12fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x848B 10644 bytes