Malicious PDF — malware analysis report

Static analysis result for SHA-256 62afdea5efcd0407…

MALICIOUS

PDF

49.6 KB Created: 2020-08-29 16:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2554da9b1c8cc4f7eb27041f8294a83 SHA-1: 41d22800436019464ff1423c451155ff797feb3f SHA-256: 62afdea5efcd040715e85640569d7ca45789030817822cc9ef52ac9fb2c30c30
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, along with a mass of other external PDF links, suggests an attempt to direct users to malicious infrastructure. The presence of a "download button" heuristic further supports the lure-based attack pattern. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=samsung+kies+galaxy+s6+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/9661/6615/files/98865364582.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/advanced_data_structures_and_algorithms_notes_for_me_cse.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5462/files/redakelugujenetet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/pumeza.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f201087b05741799dd12326d283ecb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1123d16fb5c3423fabb5776607bda751.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5c39ae288aa48338b4977a89dcd2e02.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/acrobat_reader_9_password_protect.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/19842288675.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/95734573326.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7715/files/mokodowanajabivovo.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_off000082d9.bin
5020f909aed977b601e5ac368e66854288bb766c4cb62353eed189a46719c94c
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 5632 bytes
font_01_sfnt_off0000960b.bin
5bc1d72144f7aa4dcc3e454eee8c9b2179e165a4f73b09d64ea1ad2349baafdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 10308 bytes