Malicious PDF — malware analysis report

Static analysis result for SHA-256 083be33a6a040b3f…

MALICIOUS

PDF

51.5 KB Created: 2020-08-07 05:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8009c51a0d27b581b9e16ed927c993b SHA-1: 2a04fab50cd77dd2683eabc865520dc93573658b SHA-256: 083be33a6a040b3fa1e2d6a66294a5561e152b93bc433dbe01025632f1d0f9d5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, suggests a lure related to an admission form, aiming to trick users into clicking the malicious link. The presence of numerous external PDF links further supports a link-farming or redirection-based attack. No scripts were extracted, but the malicious link is the primary indicator of compromise.

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.com/pify?keyword=ycmou+admission+form+pdf
    • http://fugob.toldyouitsvegan.com/uploads/1/3/1/6/131637016/gitisobemodatop-jisuratipat.pdf
    • http://kupuga.jwschaefer.com/uploads/1/3/1/0/131070767/nupodipenamafi_wigab.pdf
    • http://files.shermanlibrary.net/uploads/1/3/1/3/131398221/3669069.pdf
    • http://rilobabi.lisaloguebooks.com/uploads/1/3/1/1/131164243/48aeffd89c49875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0445/5153/6799/files/watauga_county_roads.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/pizudone.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/kipuxuxubejixolitivagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1049/files/tobijupebulilexuduxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/minecraft_pe_servers_0._12._1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/16790718455.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/language_skills_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/case_files_pharmacology_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5081520916.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8342/files/tegodopezaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/givoxonalokison.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/this_is_where_i_leave_you_netflix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/1621904897.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_off00006d93.bin
0c527407bc16b4f4698a5db206efc7f48f945529dbafc4f71bb3daa3289d4d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 5232 bytes
font_01_sfnt_off00007f4c.bin
26071a8215e063d700bd92a8b931022d85d01b59f033a29f4c82fdd7b7cec46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4C 10244 bytes
font_02_sfnt_off0000a29a.bin
11d2fb1d52d3760aabe0a6e41bdcd70a513eaf5076ced952aa0e03c8c23388cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA29A 9336 bytes

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