Malicious PDF — malware analysis report

Static analysis result for SHA-256 6379ccb03ca01423…

MALICIOUS

PDF

52.1 KB Created: 2020-08-15 09:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc0e0de07ede2111bcef9bd74614e15 SHA-1: 1154bc37697ee261cb2ceaea96a8f8dca91e27f5 SHA-256: 6379ccb03ca01423d977ed0250c43cbb7c43898a1d0d29ad6b51b65c02e6a096
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 resources, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://ttraff.cc/wb?keyword=theories%20of%20personality%20feist%208th%20edition%20pdf%20free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to trick users into clicking it for purported academic content.

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/wb?keyword=theories%20of%20personality%20feist%208th%20edition%20pdf%20free
    • http://files.lopezanimals.org/uploads/1/3/2/6/132695244/xajizif.pdf
    • http://doxex.authorphilip.com/uploads/1/3/1/4/131407469/a2aa67.pdf
    • http://bevunux.stebinacrafts.com/uploads/1/3/2/8/132814930/dedupedap-kusotol-setanusarosik-leduzavub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0449/2950/files/election_2020_pakistan_results_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/13072230782.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/openvpn_duplicate_cn.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/acute_coronary_syndrome_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/tosaxijowi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5863/2606/files/13844714370.pdf
    • https://cdn.shopify.com/s/files/1/0438/9437/4555/files/zibalijilosijafifodositax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/63529420327.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/kitupajedirusoxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8298/files/job_application_form_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9317/files/zirobobuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/kefedabese.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/77784768222.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/acuerdo_de_paz_en_colombia_resumen.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_off00008d48.bin
b061bba71226ad3612576e6eaea373afbd99a99a8e6b90006e50ad35f4097135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D48 5376 bytes
font_01_sfnt_off00009f86.bin
6c6d200b4be5286578b45f295fad245152fdc6f8451d26f14bda8e546fa71fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F86 10264 bytes

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