Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c70d477aa0adaa…

MALICIOUS

PDF

39.5 KB Created: 2020-08-14 12:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243da23ad33d333c9cf8c3d7a18b068f SHA-1: 93acec188d91ca2ef32418e729f6fe958be233e8 SHA-256: 71c70d477aa0adaa58ce1dccdc3a5e0a738222cc653202ba994418539b1c1721
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm structure. One of the primary links, https://ttraff.ru/pify?keyword=championship+manager+93+android, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be a lure. The presence of embedded links and the malicious redirector strongly suggest an attempt to direct users to malicious 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.ru/pify?keyword=championship+manager+93+android
    • http://sesulu.clasropes.com/uploads/1/3/2/6/132681670/tupejama_fabojaxep_welurabo_lunezalef.pdf
    • http://files.brittanyhelvyfitness.com/uploads/1/3/1/4/131454024/dipurudowunimim-jorobe.pdf
    • http://kogiparo.gonglumvrice.com/uploads/1/3/1/6/131606758/fekimeziwutef_wivajagovibafab_konat_gakunezopem.pdf
    • http://files.aliceandhenrynaturals.com/uploads/1/3/0/8/130814208/9a59735d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6186/0757/files/raymond_chang_chemistry_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/pereku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/88996341539.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/negixonejawid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/loxodebop.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/majujekakorimonigunuru.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/siwelix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/kijobakulixefawewajejam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/pebisafosazekapalim.pdf
    • https://cdn.shopify.com/s/files/1/0438/4463/2738/files/install_smallpdf_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/winogewixomowetimax.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_off00005b7f.bin
2a2eb3748f4b23fd47ab32b2d22a9f1cf62005d7ad5f7c1790640256926cb6b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7F 5564 bytes
font_01_sfnt_off00006e3e.bin
1c77a66402ffeaaf9e96a64cd1b128c26e2169fc16247620345c763dd7e65e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 10188 bytes

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