Malicious PDF — malware analysis report

Static analysis result for SHA-256 08164088d8e62e40…

MALICIOUS

PDF

45.0 KB Created: 2020-08-15 05:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc0ad0c9d1560f36fdc1a37665af3c4 SHA-1: 70bff9562ae56cc7101e8b4672455e064d353785 SHA-256: 08164088d8e62e40ab93186c9c549bb729a18bebe8a446f7d59352488ee92f97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, suggests a lure related to class answers, aiming to trick users into clicking the malicious link. The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, further indicates malicious intent to distribute harmful 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/pify?keyword=despues+de+las+clases+1b-+2+answers
    • http://files.alexoconnor-onlineportfolio.com/uploads/1/3/2/8/132814220/05530c216fa378.pdf
    • http://files.nancybrophyauthor.com/uploads/1/3/1/1/131163949/5e3a814a188eb.pdf
    • http://vupuzo.toadsandtulips.com/uploads/1/3/1/6/131607063/xilamatagakinif-kimedawarada-zufanetoku-gujix.pdf
    • http://files.katierizzoartandawesome.com/uploads/1/3/0/7/130775971/rowumonakaleru-niretevuf-sipejudisevawug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/gasijowepuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7404/3552/files/poulan_3314_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/time_clauses_with_before_after_and_when_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/41140220065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/kavifonirexepowanibimuvir.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/lofadosofevamososapusox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/70378229763.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/19648460323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/52345642825.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
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005024.bin
27df10f721a39db178e223322517ef3b3e771279654c5a68edd922636e29ff0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5024 5516 bytes
font_01_sfnt_off0000630a.bin
043275fd08f61a242a3987e2d5cd46ead7ad3b0856b8812769e4fb4fd1355f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 8976 bytes
font_02_sfnt_off000074cc.bin
f5ec27ad18316b71e4a4940687803b05ff833a4b50a400b681bcfdc90c9cc3ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 15848 bytes

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