Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f88bb5e413de288…

MALICIOUS

PDF

53.0 KB Created: 2020-11-01 07:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f25744cb2f2ad85636151df0f621aea8 SHA-1: 457ab80bf00998d9c8b291ebf33032d92158a3b2 SHA-256: 5f88bb5e413de28894933a71748700030c5a8ce8ee990141ea7ffc83bd8365b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though partially corrupted, contains text and URLs that mimic academic content, suggesting a lure to trick users into clicking malicious links. The presence of embedded URLs and the ML classifier's high confidence further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/wb?keyword=bitsat%202017%20question%20paper%20with%20solutions%20pdf In PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/fa45cf1873c.pdfIn 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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9897/0543/files/rave_master_anime_reboot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9849/8981/files/the_merck_manual_of_medical_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/makkar_ielts_speaking_jan_to_april_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9230/1718/files/gifit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9677/2249/files/19735248424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6361/3853/files/target_ps4_controller_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0157/7127/files/similes_and_metaphors_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/30078060853.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/covet_fashion_cheats_no_human_verification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7599/2250/files/ginuva.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/78532215018.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/29887375027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7241/4380/files/kimeretuwoxufulati.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gelirik.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 5684 bytes
SHA-256: 60a13ebe6e84ea12de02916e672aeb00e93b3555eeed60e3a2aa5112123965d3
font_01_sfnt_off00007803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 4872 bytes
SHA-256: 7d2b71c0fedb5194f7f0eb8abd2e4fe5e2d4fb8bb5a68c99c94b19742edf52b7
font_02_sfnt_off0000856f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 11188 bytes
SHA-256: d744a1cf02c2be782ea1ce83d67a7f2fb04df0774978380ed2a863c78b32c14c
font_03_sfnt_off0000aa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA21 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 3420 bytes
SHA-256: 10ffeadecc7c453165f268265ace65a52f2cd0069fb6fa4ab8e144d5892caf09

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