Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea26b71621aaf90…

MALICIOUS

PDF

59.4 KB Created: 2020-08-19 05:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e604651b8ddb64db136e0866e22bd8ce SHA-1: 87685358559a5645f219120e32a82f2e078960b8 SHA-256: 5ea26b71621aaf906ebdb3b542dc498a84b54420762d043d875c318277238388
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=reduce+pdf+file+size+adobe+reader+online`. Additionally, it exhibits a high-risk heuristic for a browser extension/update installation lure, suggesting a social-engineering attempt to trick the user into downloading or installing something malicious. The presence of a mass external PDF link farm further supports a malicious intent, likely to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=reduce+pdf+file+size+adobe+reader+online
    • http://files.inthemixdjsnh.com/uploads/1/3/0/7/130775205/b1980377c3.pdf
    • http://files.anxietyannarbor.com/uploads/1/3/1/6/131606876/sobuv-lebizo.pdf
    • http://files.psych205.com/uploads/1/3/1/3/131397987/biwotoresez-popisu-lefarog.pdf
    • http://kosijiku.azqualityremodeling.com/uploads/1/3/1/0/131070374/1913904.pdf
    • http://ropavotuw.internetadvert.net/uploads/1/3/2/8/132814930/jebaluvawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/fuzibomegozudarip.pdf
    • https://cdn.shopify.com/s/files/1/0439/8471/5934/files/abrsm_grade_1_theory_past_papers_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/ragemifupovaligare.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/83606032040.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/lugimovemalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/23844529530.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/56804738462.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7125/files/calendar_template_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/les_miserables_abridged.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000859e.bin
120dfd7c7977cfb9a90e0c19aa24ce80f3ad63f69756627d616fe21accc03e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859E 6424 bytes
font_01_sfnt_off00009580.bin
a5c39b44f1da8f1acb684d52c9240dac439f44c93a469e074425cafe9218a704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9580 5348 bytes
font_02_sfnt_off0000a7c0.bin
f20156bdda1f9508d00b47e7c03138e05913443d59500c20aed023020e97c8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C0 10128 bytes
font_03_sfnt_off0000caaa.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16144 bytes

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