Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3c410be053ee38…

MALICIOUS

PDF

44.8 KB Created: 2020-09-02 15:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de468005e6d195638887cc8aa510c0de SHA-1: a0183239d2c5eb581783dfdbb2a5d115a5d3a490 SHA-256: db3c410be053ee38abaaabfcf51d26a2d8f5c8d16250ac506efbf827080eedc6
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=octopus+template+library'. Additionally, another critical heuristic indicates a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0431/0702/5056/files/bofelixaxux.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains these URLs, suggesting the primary intent is to lure the user to the malicious redirector.

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/wix?keyword=octopus+template+library
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/bofelixaxux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4220/files/finding_percentages_worksheet_tes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/gapobinajurudidefimiredi.pdf
    • https://cdn.shopify.com/s/files/1/0470/8879/5806/files/integrated_reporting_training_south_africa.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3bb013c06c34e6aa3ca6e2b8b29ce4d.pdf
    • https://static.usrfiles.com/ugd/38eac1_ab528e080968442c95c55fb9e1b5d06f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c131cd4cbad45bc85f6eeee93fa6c88.pdf
    • https://static.usrfiles.com/ugd/2ca09c_8831b49cf4c248e7b5611ff01db07cae.pdf
    • https://static.usrfiles.com/ugd/50c35f_40bb9e350bd441149e42099051c3d7ef.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/collective_soul_dosage.pdf
    • https://cdn.shopify.com/s/files/1/0448/0126/1730/files/cardiac_enzymes_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/baixar24_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9100/files/morrison_boyd_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/space_in_latex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/samsung_galaxy_s10_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/pafolitazilemeje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/sibopafiwumawopoporevafid.pdf
    • https://cdn.shopify.com/s/files/1/0438/5223/4917/files/bookkeeping_excel_template_small_business.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c6.bin
2655a1a4fbf2caff5e88ddf554d61f8fc95c0a71daba8dab6b762510ee4335aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C6 5124 bytes
font_01_sfnt_off00007635.bin
79d7047b8b0c505a2edc4d498134d5de22bc73523d418e51c1c9b87802dc0791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7635 9828 bytes
font_02_sfnt_off000097e3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E3 4324 bytes

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