Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c599efa885ad27a…

MALICIOUS

PDF

40.8 KB Created: 2020-08-09 19:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532ffee53b123eb79fb141f699cba2a6 SHA-1: d9d10db4b7b702e5b94ce85ff7140e789319b5c2 SHA-256: 5c599efa885ad27aefe17796feac31e3f7cd0816d105df608b016a0162d400a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'self assessment' and includes the malicious redirector URL, suggesting a lure to a phishing site.

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=self+assessment+employee+self+appraisal+answers+examples+pdf
    • http://files.audiobooksnz.com/uploads/1/3/1/6/131606260/tuxokolodibidonero.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://files.danielleposin.com/uploads/1/3/2/6/132682070/nadutebino_jiriwefevev_jofubabiwuwivi_moguwomixupani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/sherlock_holmes_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/categorias_aristteles_livro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/sazira.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/34483862273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/catalogue_oriflame_juillet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/zavawode.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/maxutukuwusopedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/16550618148.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/pritzker_prize_winners_and_their_works.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060bc.bin
1c8cc784eaebed2be007f8c409b9ac8bee3d748b9449638a7ac9aea60690d4ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BC 5552 bytes
font_01_sfnt_off000073a7.bin
3db65fe97c587c89fc6d6dcc752138a931b6be23704123c5b558a8f41b3fc569
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A7 10084 bytes