Malicious PDF — malware analysis report

Static analysis result for SHA-256 c595faf13cf2a546…

MALICIOUS

PDF

39.1 KB Created: 2020-08-12 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a38ebc730ced9206acc5e18c58ea4d SHA-1: 2cd3ae5ffc817aa004d62656f90f08e7e562128c SHA-256: c595faf13cf2a546e6c503ec452cf49ca4ecc6131eb443943aaf1a4c4c81e17f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm with numerous links to shopify.com domains, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive use of external links is the primary indicator of 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.com/pify?keyword=bratstvo+crnog+bode%25C5%25BEa+13+pdf
    • http://files.hclleapcommunity.com/uploads/1/3/1/6/131607522/760b69cbac7.pdf
    • http://files.butsavageracing.com/uploads/1/3/1/8/131856034/18d720800996.pdf
    • http://files.chopinsocietyofhouston.org/uploads/1/3/0/8/130813736/9009488.pdf
    • http://files.garfielddiamondsports.org/uploads/1/3/1/1/131164132/3323147.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/67309551937.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/53610383060.pdf
    • https://cdn.shopify.com/s/files/1/0438/6576/8096/files/4341386109.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/vabonuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/bible_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2346/5623/files/dujitup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1167/files/arthur_miller_a_view_from_the_bridge.pdf
    • https://cdn.shopify.com/s/files/1/0437/7093/7498/files/bipamefujak.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/15174427072.pdf
    • https://cdn.shopify.com/s/files/1/0435/2308/0344/files/first_data_fd130_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/castells_communication_power.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2582/files/generalized_anxiety_disorder_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/tusonikisod.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_off00005761.bin
448addfb4d03ed4224df9cb6064ddd5c7e814f78101faa252ffa5273e71069b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5761 5836 bytes
font_01_sfnt_off00006b5c.bin
200f7301ce554fd5d73c3458a4856c2374b54ab95e72dd956dc3ba60e6604065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 9840 bytes

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