Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88eb0bda0f581bc…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 03:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311da98ed8fd99283dc1c7018f7f9ed0 SHA-1: 466f4be8299dc803d87885e988a8eb31a203752d SHA-256: a88eb0bda0f581bc5615f3c23864bba8cbff1f0c386d830952de9496b3f0188e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm strategy, likely intended to obscure the final destination and potentially phish users or deliver malware. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=budgeting+and+financial+management+in+education+noun+pdf
    • http://files.edwardvisualart.com/uploads/1/3/2/6/132695732/gosojajakizap_rekigunukug.pdf
    • http://files.criticalwork.org/uploads/1/3/0/9/130969061/bosijupi_morifizupol_xofurolukifa.pdf
    • http://files.thefeltedbee.com/uploads/1/3/0/7/130740069/tukowurufole.pdf
    • http://files.entrepreneur-srilanka.com/uploads/1/3/0/8/130874284/zizabujivu.pdf
    • http://files.hisheartfororphans.com/uploads/1/3/1/8/131855981/nijuxuvo-sosilajafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/12206347583.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6293/files/serupisosukusibokebuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/bamitukerofalusutokej.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/sizajixilinoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/dumez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/99134525003.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/canon_rebel_t3i_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/chapati_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4866/files/mewuguduwazesomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/les_infortunes_de_la_belle_au_bois_dormant_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1160/files/sufasesujof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/suxemupokibodugenowaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/divetujuwu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fc.bin
c28f8eba280a96a92c589336c1e84ac75132f7df8838fe1fa02e01c09fc69ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 5252 bytes
font_01_sfnt_off000076d8.bin
6eee46827caefe9aa10e4578075ebdaa8cd11fa7597da6ca433427cecdc0c617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D8 9964 bytes

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