Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa94f85db51eb5fc…

MALICIOUS

PDF

35.2 KB Created: 2020-08-13 15:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160a259ee811f2afd5a4a03ecc4ed245 SHA-1: 32c08ed039e126a1f00d161384adcfe46d04d310 SHA-256: aa94f85db51eb5fc7c1425fa521e0c9cbf5948d32934cf9603249696c3aa3ca5
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Algebra 2 topical review book pdf' and includes the malicious URL, suggesting a lure to trick users into accessing potentially harmful content. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attempt.

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=algebra+2+topical+review+book+pdf
    • http://files.unlockyourchildspotential.com/uploads/1/3/1/4/131438539/03f89dff221068e.pdf
    • http://files.mistergmath.com/uploads/1/3/2/6/132682737/4682217.pdf
    • http://files.bee-kleen.com/uploads/1/3/2/6/132681887/4998236.pdf
    • http://ludokedem.sweetpeasunshinestudios.com/uploads/1/3/2/8/132816066/3249091.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/kuxurojiroxugezetizikori.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/donojejibatimusija.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/19734573654.pdf
    • https://cdn.shopify.com/s/files/1/0435/8668/3037/files/50210349677.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/is_it_legal_to_download_youtube_videos.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/budget_speech_2020_mauritius.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/30226904796.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/bifobudotebowabil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/transfer_on_death_deed_california.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/polarity_test_of_3_phase_induction_motor.pdf
    • https://cdn.shopify.com/s/files/1/0434/5413/6473/files/scert_kerala_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/kebafoxodu.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_off00004a77.bin
9946ce20f550059217a1077a8e714e15d31c6bfa54875e9dbf79b171f127d3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A77 5620 bytes
font_01_sfnt_off00005dba.bin
ec4f35a1a9a1d97098023b9fc5433f70c9465abd9bbb4bf81eeb827d7bbb8e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 10016 bytes

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