Malicious PDF — malware analysis report

Static analysis result for SHA-256 75865af4f95e35ec…

MALICIOUS

PDF

38.0 KB Created: 2020-08-17 12:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4451522acc5e6aa5bd7ad09571602cf SHA-1: 7710f1987f9bfbfc10cae9e18e5dacf0ad6b5328 SHA-256: 75865af4f95e35ec251318be171c80ae9c84b142c119d7a4d63bc535fa6c85ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The document body and embedded links suggest an attempt to drive traffic to potentially malicious or SEO-poisoned content, rather than a direct phishing or exploit attempt.

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=best+self+company+pdf
    • http://files.altcaresolution.com/uploads/1/3/1/6/131637365/josobizogebabiw.pdf
    • http://files.domhowell.com/uploads/1/3/0/7/130775172/konedededudogozuf.pdf
    • http://tapubosa.kalasimports.com/uploads/1/3/1/3/131379935/fawaxediba-weved.pdf
    • http://files.energycyclingclub.ca/uploads/1/3/0/7/130739651/taguga_wufujiwigata_vekipokeruwu_nobutido.pdf
    • http://files.carmineruddy.com/uploads/1/3/1/0/131070983/kuvikelobagip_xadufukin_tufipitekipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/87469457517.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/rifoxijubewekuvadomel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/2020_monthly_calendar_editable.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/sandesh_news_paper_surat.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/cancer_mammae.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/anakin_skywalker_midichlorian_count.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/xokalifikomubulodug.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/pdf_file_reader_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/stardew_valley_furnace.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/jepesaturukigi.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_off000057bc.bin
a8c10d29799982cf55b6bb378a1b5f3d24f47b1a2f594fd42a100d87ce6b9a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x57BC 5356 bytes
font_01_sfnt_off000069e6.bin
967a2b332a6784f4f23df9fec62bb85e47b036c3504ce5f3ae4abf348a948a16
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 9888 bytes