Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefcf274ae83f794…

MALICIOUS

PDF

41.5 KB Created: 2020-08-17 10:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d4e4244f7db8b36a2330b6068c2b7b SHA-1: f22e245acb5d1db553405836e862ec3e39846af6 SHA-256: aefcf274ae83f794cd6dbde5974d48b50491914e115c703dcb6a69d8c357b4a4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=reported+speech+with+modals+exercises'. This indicates the document is designed to lead the user to a malicious site. Additionally, a PDF link farm heuristic was triggered, suggesting the document hosts numerous external links, many of which are likely part of a SEO-based lure to attract victims. The ML classifier also strongly flagged this PDF as malicious.

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=reported+speech+with+modals+exercises
    • http://bagisisir.awaredriving.com/uploads/1/3/0/7/130775531/sewibom_xuvobulom_wedesutuxilaxa.pdf
    • http://nitowokir.mitsstools.org/uploads/1/3/1/4/131437615/5549429.pdf
    • http://files.conejoroyals.com/uploads/1/3/1/6/131606697/setatidivumoraj.pdf
    • http://derakes.hardstoneresources.com/uploads/1/3/1/3/131383591/1114726.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/guvujudef.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/bsg_watch_order.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/birthday_card_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/honda_civic_2013_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/5819821451.pdf
    • https://cdn.shopify.com/s/files/1/0441/1644/3288/files/qasidah_burdah.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/gisadilakisefujejemuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/namebediraratawuxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/cisco_ccent_ccna_icnd1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5562/0006/files/cultural_assimilation.pdf
    • https://cdn.shopify.com/s/files/1/0435/2835/6000/files/clarence_larkin_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5522/files/80643663015.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/rutovuxokoxusefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/85108400156.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/workbook_software_free.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_off000063c4.bin
de94b5e6a73954aee168d07090094243bf9f90fe6b1f4611d4a5b6a4d35d225e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 5480 bytes
font_01_sfnt_off0000765b.bin
6cd40f91b450b4123d07957d84ec11af7b652d64b81fc8e01d92b3e9121e478a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765B 10040 bytes

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