Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b86f665110dc4c…

MALICIOUS

PDF

69.8 KB Created: 2020-08-26 08:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36412f6508ce7baf49b32e007871c472 SHA-1: 3be0d530f26fa688c028817ea4e0754b475e372c SHA-256: f8b86f665110dc4ccbcfec4d4330416dc5e0d8b235dba31bb96816755dff9126
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a "bill browder red notice pdf" and includes the malicious URL. The presence of numerous external PDF links suggests a link farm or redirection strategy.

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=bill+browder+red+notice+pdf
    • http://files.kelseysq.com/uploads/1/3/1/8/131856698/nojevufoma-kumukefizik-deroz.pdf
    • http://files.paulandtashamassage.com/uploads/1/3/0/7/130739919/5268012.pdf
    • http://files.concretesaturdaymarket.com/uploads/1/3/0/7/130738823/699609f7c.pdf
    • http://zadagoz.pacificcircleconsortium.org/uploads/1/3/2/6/132683001/kasanedumugebopoxure.pdf
    • http://files.tonchairs.com/uploads/1/3/0/7/130740018/kinasegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/waranusi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/pavozokesajewiretafakesit.pdf
    • https://cdn.shopify.com/s/files/1/0464/5493/1624/files/51541442786.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/zutiduratugabutonavek.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/sap_cloud_platform_service_marketplace.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/244373287.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/quimica_peter_atkins.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/bituzesevogiwugot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/garage_band_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/baby_crying_sound_effect_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2116/3941/files/gist_say_n_on_spotify.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/tefawemu.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_off0000d450.bin
cd123426e2adfbbbf396433f44e6706907a4255af52392938338b470ef947b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 5044 bytes
font_01_sfnt_off0000e58f.bin
43b13f199646b33f3a4eb5c1512b9ec01ce6165bea5d207fb1b6b29efb9ee4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 10748 bytes

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