Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6a9593e86cd3b4…

MALICIOUS

PDF

53.8 KB Created: 2020-08-21 04:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1c79ef45dcd1afb14b7f156947b231 SHA-1: 97c016cd4acae31c844c7d92d072450796b7a60b SHA-256: de6a9593e86cd3b4f44f96e88ffbc06b447872d80a1fa22d0b3d77b07456d581
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, disguised as a visa application form. This indicates a phishing or social engineering attack. The PDF also contains a large number of links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=korean+visa+application+form+sample+2018
    • http://files.career-readiness.com/uploads/1/3/0/9/130969143/b30920f4f88.pdf
    • http://files.appleseedsquares.com/uploads/1/3/2/6/132681452/titoke-paduzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/tarjetas_auriculoterapia.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/english_unlimited_b1_student_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/reading_vocabulary_development_3_cause_and_effect.pdf
    • https://cdn.shopify.com/s/files/1/0429/4528/2214/files/vitamin_b_deficiency.pdf
    • https://cdn.shopify.com/s/files/1/0443/4988/2524/files/metallica_one_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8695/files/jemus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/guess_who_s_baby_picture_game_template.pdf
    • https://cdn.shopify.com/s/files/1/0445/6303/8367/files/suwumapadukinonuzade.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5366/files/crash_bandicoot_pc_size.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/tube_tamil_vijay_tv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/zomokufume.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/73290623974.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/1117188589.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aa7.bin
d7087de4462ce7b2889f842324e91eaed2d25fc557e405e8a48715dfc80ee856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 3592 bytes
font_01_sfnt_off0000876a.bin
45f5446541b1afb4b2cbf42f03ce0a20accff5c017c87d226a143e8a27f28f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876A 5708 bytes
font_02_sfnt_off00009ac5.bin
9059473c4baf4b2df1d14404b0b0560d5a57f7b82054dcb55b5a5bda586094e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC5 2424 bytes
font_03_sfnt_off0000a445.bin
e5ba48eafc88c7b4bd4754eb607f4e362006f746972ff3febab5a55541c217d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA445 10828 bytes

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