Malicious PDF — malware analysis report

Static analysis result for SHA-256 a203a71d868899fa…

MALICIOUS

PDF

43.0 KB Created: 2020-08-25 16:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153f7028b8263fbf3917cadb09939dfc SHA-1: 54b2dae4efaf7c433b3eddf7e28bb4845b0657f1 SHA-256: a203a71d868899fa138028b420baf49620d2e1ea151fb1281e0918fd08e5bdda
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to educational worksheets and includes the malicious URL, suggesting a lure to phishing or malware distribution sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users.

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=nonfiction+reading+comprehension+worksheets+9th+grade
    • http://numip.votelogan53.com/uploads/1/3/2/3/132302780/wejazidusazat_mapavilaw_sejiwofek.pdf
    • http://tebiton.fbcbelfast.com/uploads/1/3/1/6/131606457/zajenuzif_duvawalixe.pdf
    • http://xemop.blossomingbookwormswithstephanie.com/uploads/1/3/1/3/131381533/ninunebofobuzap.pdf
    • http://fiput.melisseairesbooks.com/uploads/1/3/1/4/131483337/6259889.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2118/files/what_is_a_normie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/around_the_world_in_80_days_children_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/savirawosora.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/sales_manager_cv.pdf
    • https://cdn.shopify.com/s/files/1/0460/8144/1956/files/titanic_theme_song_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/palijafazikerudivodona.pdf
    • https://cdn.shopify.com/s/files/1/0438/0357/4432/files/bled_orthographe_grammaire_conjugaison_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/70205852844.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/40547094924.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/jodofiriwuwafozaxuxarutex.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/57036309468.pdf
    • https://cdn.shopify.com/s/files/1/0434/6186/9733/files/47170666256.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_off000067be.bin
3828cc13e3177121625c491f5dd3bcbad4dd0406a42663e4bcf6871968248980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BE 5816 bytes
font_01_sfnt_off00007b70.bin
5b1fede1497ae50896b16cf1899c75f47e517367fed183b2fed20fbeaaa503db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 10368 bytes

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