Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aef9c312addab4…

MALICIOUS

PDF

64.8 KB Created: 2020-08-08 12:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193fe772dea0a23008d59c7278a26801 SHA-1: 201b7a0d1fa0967cc4f2a562b0ac9fd8f8ded848 SHA-256: f0aef9c312addab441dab3d28948b672ad29f03d79e9b2fb40e97f71fc1282f3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=alfabeto+japones+pdf'. The document body, though heavily obfuscated, contains text related to 'Alfabeto japones pdf' and the wkhtmltopdf application, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=alfabeto+japones+pdf
    • http://files.sueconsidinephotographics.com/uploads/1/3/0/8/130815277/68d5455e2ff5.pdf
    • http://files.dare-tobelieve.com/uploads/1/3/1/4/131407227/7100622.pdf
    • http://files.iambriannna.com/uploads/1/3/1/4/131414743/1687799.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/97894681425.pdf
    • https://cdn.shopify.com/s/files/1/0445/3951/0948/files/my_english_book_class_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/calendario_2020_gratis_da_stampare.pdf
    • https://cdn.shopify.com/s/files/1/0438/2880/5789/files/65729565069.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/jquery_validate_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0441/4429/6088/files/73733169816.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66264102559.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/jazz_guitar_beginner_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/48129986419.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/lufenozimewigidavivarogo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/7913317138.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/biceps_exercise_chart.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_off00005d72.bin
71140a37d39483eb61c012bde2dca6bb454a9d9275f1d9dacf3bac6d44faeed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 27212 bytes
font_01_sfnt_off0000ac13.bin
f062cd396b91c13242c2eea755301526916e624fcc67487c2cbafd6d09eeba5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC13 4884 bytes
font_02_sfnt_off0000bcc6.bin
c9083866cff4f9dbe1a80edf6022a429a60bb83cc46857e88362950024d1fec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 13816 bytes
font_03_sfnt_off0000e62f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 4324 bytes

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