Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd735b20f3d86582…

MALICIOUS

PDF

43.4 KB Created: 2020-09-06 06:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 12d86e1c4fb4cc2e04873816763afe2b SHA-1: db8930db292f1812f37b5fc18765f0f3ec5bee5c SHA-256: dd735b20f3d8658242d6acf5c94f5e425df1f52bf692b7137acb98eb175441ff
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes the URL 'https://ttraff.link/pify?keyword=bodyweight+squats+proper+form', suggesting a lure to a malicious site. The presence of a large number of PDF links, many pointing to Shopify, indicates a link farm strategy, likely to obscure the malicious redirector or for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=bodyweight+squats+proper+form In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/fesekolezar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0840/1306/files/analisi_periodo_esercizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8654/4022/files/water_filter_plant_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/gofebaxazepereko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2683/0744/files/spoken_english_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/direct_and_indirect_object_pronouns_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/50336093805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2653/8911/files/benign_prostatic_hyperplasia_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/32757389154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2503/1587/files/65419619537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/borland_c_5._02_free_64_bit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/53338507253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/41966006934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/brick_by_boring_brick_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/tinonulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/79690403847.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 5792 bytes
SHA-256: d3ff82d13bf90b2fec4bf50c98d62bfed613de352fe53818ee453abc8b3092e9
font_01_sfnt_off00007ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECC 9964 bytes
SHA-256: fe1377d5dd8cb972f59b91648948386945dc083269848dd94350f881fc1ba6a6

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