Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bdc2c8c0a00e65…

MALICIOUS

PDF

42.0 KB Created: 2020-08-22 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d626ae5e10a93a3d897508781b4d6e SHA-1: d4f7d990051c809a2f2821d7422111a335dd50e9 SHA-256: 48bdc2c8c0a00e65561327a0b4cd4c304e284893a0ef6689bdc5b132eba41ac6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains references to the malicious URL and a benign-looking PDF file, suggesting a lure to a malicious site. 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.ru/pify?keyword=action+bar+back+button+android+studio
    • http://nokon.renuent.com/uploads/1/3/2/6/132680813/debodedumug.pdf
    • http://files.smallwonderjewellery.com/uploads/1/3/1/1/131164473/285b213a8990.pdf
    • http://files.solomonfilmdetroit.com/uploads/1/3/2/6/132681460/bikerigam.pdf
    • http://rorixi.coastaltransfers.com/uploads/1/3/0/7/130776499/cb1dd151.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/anglo_assamese_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0157/5586/files/32822176733.pdf
    • https://cdn.shopify.com/s/files/1/0441/3181/1480/files/tixekowaladogasoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/4316/6107/files/zovezufoforupiwuwagu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/gungeon_gilded_bullets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8018/8058/files/resmed_s9_autoset.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/87929519260.pdf
    • https://cdn.shopify.com/s/files/1/0463/7927/0299/files/5th_wave_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/runipomesatuvux.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/vezulipedoke.pdf
    • https://cdn.shopify.com/s/files/1/0445/7175/4655/files/peter_handke.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/14906790584.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/71855511481.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/91397825698.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc8.bin
3547f3baa5fbaccd9cceb5d4e073cbd84820ccfed045d0c2672671adc24f134e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC8 5092 bytes
font_01_sfnt_off00007114.bin
587dbc06432beef3f97ddf1ecc6e9bfdae54e8f9b229db3a18a0402063ced91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7114 12964 bytes

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