Malicious PDF — malware analysis report

Static analysis result for SHA-256 0724fe4d871e6623…

MALICIOUS

PDF

44.4 KB Created: 2020-08-06 03:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96ce0b94af8011e6c4630252960af365 SHA-1: 03d124c4ab5abd7ea389154f9ca7479c0cb7d290 SHA-256: 0724fe4d871e66238707f04bd51acfe84ed7c8f675656cdf8a2d30631cca760d
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL 'https://ttraff.com/wb?keyword=reconnaissance%20de%20dette%20pdf%20gratuit%20a%20imprimer', which is flagged as a malicious redirector. The presence of a mass external PDF link farm further supports the malicious intent.

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/wb?keyword=reconnaissance%20de%20dette%20pdf%20gratuit%20a%20imprimer
    • http://gasemel.klmny.com/uploads/1/3/1/4/131482995/5686000.pdf
    • http://files.stouchstudios.com/uploads/1/3/1/4/131437848/9797036.pdf
    • http://files.karaites.org/uploads/1/3/2/7/132740485/torewamulix_nanupog_tokebunegapi_pabipo.pdf
    • http://files.premiermedicalsupply.co/uploads/1/3/0/7/130738988/revol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/raxaxaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/95353093199.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0555/files/91307880313.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/teaching_creative_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/42905509264.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8311/files/gujimafalidajafezibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/sesajatirewukibukiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/western_states_lottery.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/41015105828.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_off00006993.bin
91f81fb5060160945d3a079e23e813648946c8a63268913f05576bdcda4ac2ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6993 5448 bytes
font_01_sfnt_off00007c11.bin
718a919f8a4ee863ff0dfa1a01d672a1052003d57090fdf86fe5bf84bcbbc1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 12460 bytes