Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b49fe440d2f0d4…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcfd7e9591a944830cdc2073829cbb36 SHA-1: 3b2295d9d7e4eb6622eba516e53891fcb5c5a801 SHA-256: f6b49fe440d2f0d4013204f56214df6c7b67742171f78be29d7f35835a534ecc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious redirector at ttraff.cc. The document body, though partially corrupted, contains text related to 'literary terms practice worksheet' and the malicious URL, suggesting a lure to trick users into clicking the links. The ML classifier 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=literary+terms+practice+worksheet
    • http://files.mountbattie.com/uploads/1/3/1/3/131378780/bajabeb_vuxaloliwunepi_kixubusetoxelit.pdf
    • http://files.kasaunhenry.com/uploads/1/3/2/6/132681665/522692.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://pezidofof.art4myhome.co.uk/uploads/1/3/0/8/130814328/af669541a4f21.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7207/files/reducing_stress_at_work.pdf
    • https://cdn.shopify.com/s/files/1/0453/2440/2843/files/ravimemokurulumubitu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/subway_map_los_angeles.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/2913778439.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5388/files/introduction_to_organic_chemistry_brown.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/pizemi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/atomic_habits_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/juwivujamivivedabavozix.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/wixisoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/knight_physics_workbook_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1845/files/gta_5_online_money_hacks_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/64822979725.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/49672858028.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/71011458952.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_off000066d2.bin
2400a707137b8cd26bb36f56a9aef05548fef2e8af41660bdaa22dcccead709c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5340 bytes
font_01_sfnt_off000078ee.bin
13bea4778b26cc251df99b972fcf8806388913c845e9e8ac953a7c3d48c249dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10192 bytes

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