Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ad1ba9ea924621…

MALICIOUS

PDF

50.0 KB Created: 2020-08-09 23:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced8d83dfee538e25fa3e007b33b658a SHA-1: 918352a405c49fb65ff2f43671cb56608312f2f6 SHA-256: b9ad1ba9ea9246210c063f71c5c14bccc8a40fe5b40d7b016da76354d6a6f2e5
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a high number of embedded links, many pointing to a redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=dietoterapia+cirrose+hepatica+pdf, which is likely used to direct users to further malicious content. The document body itself is heavily obfuscated and contains what appears to be junk data, further indicating a malicious intent.

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=dietoterapia+cirrose+hepatica+pdf
    • http://files.livelypr.com/uploads/1/3/1/3/131379409/rimoguwogoz_kavajuvekufuf.pdf
    • http://files.chocodiego.com/uploads/1/3/1/8/131856186/64822344c.pdf
    • http://files.bronzedoklahoma.com/uploads/1/3/1/8/131871704/minulogise.pdf
    • http://xagumap.kidsks.org/uploads/1/3/1/6/131606289/d5ef8c48d.pdf
    • http://kududuki.wanlinbicycletours.com/uploads/1/3/0/7/130776445/tujege.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/html_codes_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/i_see_the_light_karaoke.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/74939429447.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/dalupijokolu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/broselow_pediatric_tape.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botudurodakokebavexosox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/e_business_journal_article.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/bobav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/mepoloxive.pdf
    • https://cdn.shopify.com/s/files/1/0437/6913/5262/files/atkins_physical_chemistry_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/visual_boy_advance_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/discord_embed_message_bullet_point.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_off00008602.bin
db8c11429ac2bd7c74a8a3b680a547cd292d11e3511658c9369ebf75d2e66d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8602 5212 bytes
font_01_sfnt_off000097b6.bin
f62c72965f643f091b577a13edc45ddd57001dbb5c1dcfc46ef3e7fc166cccc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B6 10472 bytes

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