Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ec27c040dfea7c…

MALICIOUS

PDF

35.7 KB Created: 2020-08-15 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da10d29b4385f7a15293757cf72eddfe SHA-1: 138e7f73ff918e50170917080db4d7492a7bb2bb SHA-256: 02ec27c040dfea7c47387b27c4457eb3f2b7c2c3617f5233305383d3e087953d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The ML classifier also strongly flagged this PDF as malicious. The document body itself appears to be malformed or obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

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=r%25C3%25A9forme+fiscale+luxembourg+2017+calculatrice
    • http://refepi.theideatree.org/uploads/1/3/2/7/132741099/8258281.pdf
    • http://dijapute.marktravels.net/uploads/1/3/0/7/130738970/giropimurepowol_jugeniguv_madenajidigeko_zunos.pdf
    • http://bopax.vipwoodenpens.com/uploads/1/3/0/7/130775918/1676404.pdf
    • http://files.savefarthingworthgreen.org/uploads/1/3/0/8/130873840/9027896.pdf
    • http://files.barbadosintoronto.com/uploads/1/3/1/1/131163834/rupaxokumid-kepumivar-jomikuden-beputivebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3864/5151/files/cradle_of_rome.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/fepedadoxibamopimev.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/xekunimakonajosufawulotor.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/cambridge_igcse_mathematics_core_and_extended_third_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/american_airlines_logo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2031/9893/files/31865952522.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/bogapezadunirenogugorole.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/twilight_breaking_dawn_part_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/33652101156.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/tekkit_legends_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/42802222887.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/6559168627.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/oxford_discover_2_grammar_book.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_off00004b12.bin
1a29797fa2dbffed611d7e39b3cebfac0da6a500bb290f86cbc808e4b949db37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B12 5964 bytes
font_01_sfnt_off00005f21.bin
d16c47729248af7739e9b996e53f6fe4693e2011182562550364f106f8d23602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 10192 bytes

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