Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b75ddf422f2fbb…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0267f17eb81e3606d6d15147a8e689fb SHA-1: 5fb484abd66e4770b52bb1a2fc8a5dde7bd77430 SHA-256: 14b75ddf422f2fbb87b68b54df6e219b1193f331239231c4edacce6a205f0dad
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files. One of these links, https://ttraff.ru/wb?keyword=diagnostic%20pathology%20cytopathology%20mody%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious infrastructure, potentially 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.ru/wb?keyword=diagnostic%20pathology%20cytopathology%20mody%20pdf
    • http://files.cantormalachi.com/uploads/1/3/1/4/131409884/zivun-sevafuf-tedupiwomiwati.pdf
    • http://files.conresnet.org/uploads/1/3/1/1/131164273/novig_rakalibivabeto_vusoxufugubafa_xatawuwa.pdf
    • http://files.thedomainhobart.com/uploads/1/3/1/3/131380850/596616.pdf
    • http://tonisog.annebeancreative.com/uploads/1/3/1/4/131407089/zezepobak.pdf
    • http://files.longtengusainc.com/uploads/1/3/2/6/132695190/dadug-pazuvulil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/chng_trnh_c_file_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/invitation_to_computer_science_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/7020/8662/files/24879582578.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/segagem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/39043415902.pdf
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/bolijadeka.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/carrier_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2977/files/organizao_do_ambiente_de_trabalho.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/95204128535.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/38181991382.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/zokor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7668/files/zegasepesaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.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_off00006025.bin
5c9ad36a2bbf56de6f6fa899acc4c69735adea8fa2a81110aec15abc7d0b32bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 5572 bytes
font_01_sfnt_off000072ff.bin
3dd0ef168f4c6435b5bffd6ef4eaf1a9adad3af4e364f5ba704196ff3e322fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 12656 bytes

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