Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aa562e43ddeb55…

MALICIOUS

PDF

40.1 KB Created: 2020-09-05 21:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eddf9761adb7ea8c9a3ebf25fda6925e SHA-1: bd7b46821e432e9bedbb7a88ef1ce290bf283e05 SHA-256: 50aa562e43ddeb55c4cf5a878c153eb9839ba6735bd38027ff2d1438d69e65ed
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, disguised with a keyword suggesting it contains answers to practice questions. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a link farm designed to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=autentico+2+core+practice+answers+page+58 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/1a94e8_d7c0cacc3fa243ac8599baba9d3e6bce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/20d83a_4074409ce93b481bbd94e554cac207b1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/362633_7a46f1d337a34491902222518daa9a8b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1f5cef_b6ec846877674d68bc67bc2368abd216.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7306e_06eda1da910143dbb004ecadd99847be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8ac1ab_de685c9a282143e1b66c3c04c561057a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/338562_6a53a98492e54d3d9f3b154037315de8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0aab01_2abee2104212463cb263c6ebb8b47edc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b11f6d_ee4d55afc21f414fbfa0c6f4f6782292.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c450b2_870d832615f54907a6d134465b5e612b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7528/0552/files/portugus_antigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/3259/5867/files/extenuating_circumstances_form_cardiff_uni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/3235643605.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/blacksmith_forge_stove_operating_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/3910/5700/files/android_data_eraser_software_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/tegabixofibos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/ielts_exam_answer_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/muqaddar_bhojpuri_movie_dj_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/2406679704.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E76 5480 bytes
SHA-256: 8cd6d0c2d9f59fa381da9213dd33593a46be159dfb88264a04bed0793ae8f6f2
font_01_sfnt_off00006131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 10500 bytes
SHA-256: dca216aeab7a83a98e2d33b8be075bf77e383125943ae9b7f654f72c4405b2d8
font_02_sfnt_off000084cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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