Malicious PDF — malware analysis report

Static analysis result for SHA-256 713463bbd97f736b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 20:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fd1ad38482c6405c7996bd3595a33ef SHA-1: 8da7017f2583ca886a7facf49dde11254acd8d24 SHA-256: 713463bbd97f736bfe649d8d3e1bb503e7d3c8754b1fedd7f086a4d853e5cf53
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, suggesting a link farm or redirection scheme. One prominent URL, 'https://ttraff.ru/pify?keyword=congratulations+card+template+printable', is flagged as a known malicious redirector. The document body, though partially corrupted, also contains this URL and references to 'congratulations card template printable', indicating a lure to entice users to click the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=congratulations+card+template+printable
    • http://files.floydmath.com/uploads/1/3/0/8/130814687/11b6e381e6d.pdf
    • http://vijuzijam.thetomallanvarietyband.com/uploads/1/3/0/8/130813765/mufekodozuk.pdf
    • http://pepigo.oakheartarmory.com/uploads/1/3/0/8/130813306/wiporugofipoto_garebojamiminu_tutedoxusalate.pdf
    • http://files.egyptiangift179.com/uploads/1/3/0/8/130874110/kirevu_potakapa_wokozogo.pdf
    • http://files.couleeregionfitness.com/uploads/1/3/1/0/131070713/68912e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/24795858885.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/3683289982.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/57303556850.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/loxuxiniwududiwisugogu.pdf
    • https://cdn.shopify.com/s/files/1/0463/3214/9915/files/63424247835.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/figivovevemif.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/38909071220.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/46578641485.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/updated_gina_asthma_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/42325867738.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/xokufowunavumisaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/damusinudorabok.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_off00006483.bin
dd8a914d7e2dc3a1959f95ccf1b9bd9bb8736721227356a2fd3729279e004c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5436 bytes
font_01_sfnt_off000076d9.bin
9972a99a3214f308a841e4813b7e4f488827c8302e06a70b3a432f3ec7855c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 10140 bytes

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