Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e825c92bd4fcd3c…

MALICIOUS

PDF

37.0 KB Created: 2020-09-01 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ccbbaf4d82253d007042179c9a9b80 SHA-1: d01736344bba5ab2e8e0fbc9076b482dc148a37b SHA-256: 0e825c92bd4fcd3ca4154e794fb4b08d741c4b88856267c4349b3ac9f9d1282f
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as interview questions, which redirects to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm, likely to improve search engine ranking for malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest potential for JavaScript execution to facilitate the 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.cc/wix?keyword=itc+infotech+interview+questions+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_bf9c468857594894962c9dc63e4cee9e.pdf
    • https://static.usrfiles.com/ugd/9734e7_bd13f85dcdb64b0f846f8104b4b370e0.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_584d5868f86242bdb77af81195443e61.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2190803f6a4aa79018dbb087649e63.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b5bfde6c493b41ef8245b97cfe50c0b3.pdf
    • https://static.usrfiles.com/ugd/c33cdb_587a6f10d0484b4dbb0021292851c8f3.pdf
    • https://static.usrfiles.com/ugd/493135_6779b958b58341839fc033634797072f.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0783/files/sharon_rogers_future_fight_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/85443378349.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/pirukufozaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/ravaferuwapotomu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/enfoques_de_calidad_de_vida_en_el_trabajo.pdf
    • https://static.usrfiles.com/ugd/e745be_2cda695f39b742ca8d558e5edb5da6d4.pdf
    • https://static.usrfiles.com/ugd/6908d7_fdeb47750e4147d3973dd5dbe3abc99e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004504.bin
5477cf15394ce2613b32f597896aa74b9b968ae4edeccab956e8084f68dc33e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4504 5036 bytes
font_01_sfnt_off0000562e.bin
d6e085ce656ef73c407944d185ed186e62689ba854d9ced6b58cdac86ad945d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x562E 10612 bytes
font_02_sfnt_off00007920.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7920 4324 bytes

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