Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e4a13fbdd54855…

MALICIOUS

PDF

37.3 KB Created: 2020-08-25 18:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34db52dbd7d1350e574bd4a2d7513b5c SHA-1: 68bc5c3c8aebe4b3a6f82415837d7529b98f02da SHA-256: 08e4a13fbdd54855e2d948b3c0a9746ec61ca84fcd0f1d6684205337307d0192
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.cc/pify?keyword=phantom+tollbooth+study+guide+answers, which is flagged as malicious. The document body, though heavily obfuscated, contains references to study guides and URLs, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=phantom+tollbooth+study+guide+answers
    • http://files.slowlywakingreason.com/uploads/1/3/2/8/132815003/zakolugoviwonot-kubovelalubemet-mufewina.pdf
    • http://files.helpbuildit.net/uploads/1/3/0/9/130969525/3550603.pdf
    • http://files.babycastinguk.co.uk/uploads/1/3/0/7/130775649/0e5103c89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/juwutegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/fudoguturugegevasodap.pdf
    • https://cdn.shopify.com/s/files/1/0448/0620/9702/files/alopecia_areata_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/9403/9975/files/php_show_all_images_in_folder.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/atoms_and_molecules_worksheet_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/wemuwopolavarison.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/teorias_causalista_y_finalista_de_la_accion.pdf
    • https://cdn.shopify.com/s/files/1/0445/6952/6436/files/byzantine_literature.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/velivapu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/balance_sheet_translation_to_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/fakebodadafoladu.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_off00005366.bin
ab08099d4998e7c67aecc694db8f6fdd27a0303c5ebfa2061901479cf1ee2b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5366 5572 bytes
font_01_sfnt_off00006635.bin
0d222ce99db4f5fb5a13357d2ae11d01d3d2d67be53b984b722a8e00d82652e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 10056 bytes

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