Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f631743d3667c2f…

MALICIOUS

PDF

43.2 KB Created: 2020-08-11 16:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3fc4bb73a22829a4e1a7a6616f10e68 SHA-1: 75f56837c154a872033d99d7ef93ffac3f156a4c SHA-256: 6f631743d3667c2f620fd4ca43223f9188afb23c31008e4a52577c2598e6d5dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted from this sample.

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.ru/pify?keyword=physiotherapy+exercises+for+cervical+spondylosis+pdf
    • http://files.fhrevive.com/uploads/1/3/0/9/130969593/sumutarib_mabojasikuxa_mexaz_leraputedojo.pdf
    • http://files.teigandraigcollection.com/uploads/1/3/0/7/130740073/a56a960c2.pdf
    • http://lewamuda.showmerob.com/uploads/1/3/1/3/131380429/velujogugisubetow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/deteperu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/samolifapibaziroditanagot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6502/4412/files/firogojutujumupupuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/dieta_cetogenica_tramos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/43750179382.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/nipagutiwejepubo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/fugoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/asuhan_keperawatan_endometriosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/57286172350.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/1001_arabian_nights_free_download_gujarati.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_off00006b35.bin
a37e36469dfaecd2e4132bb0eded821e72b8733a4edb795f9f4174fdc7c8f722
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 5476 bytes
font_01_sfnt_off00007dd3.bin
853ed13142ef3678fa765387c1f58a58022cc9e41b2ba7974c2bed6174fc5fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 9820 bytes