Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdefccbeed3e0ab…

MALICIOUS

PDF

87.7 KB Created: 2020-08-21 06:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe87ef5993b4f0dd3f2b9b377f28ee6 SHA-1: b6d522f9e4f4efbcdad01aa1edb3b6db3d6f381d SHA-256: 2cdefccbeed3e0ab6924f0bbd6174313e611d25665cd482c17ad0c0ea9b010cb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the string 'Adb devices unauthorized android' and the malicious URL, suggesting a lure for a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

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=adb+devices+unauthorized+android
    • http://files.justinsports.net/uploads/1/3/2/7/132740253/5cd36.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/munolobakokupexujujili.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/cyrano_de_bergerac_edmond_rostand.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/best_paid_beat_making_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/when_boy_meets_girl_joshua_harris.pdf
    • https://cdn.shopify.com/s/files/1/0437/3941/4677/files/color_by_number_addition_worksheets_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/bodyweight_workout_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/23873357931.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/hipster_guide_chiang_mai.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/jujopurus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/74041426298.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_off00011b09.bin
a385f6b5b307e056bfc39d39622ab01989d619c25087a4a6316071a48b6bc120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 5232 bytes
font_01_sfnt_off00012cd3.bin
00c3cf357eeed73a5946837ad30e7c8c786ab2841091005e0c0fe008bc208dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 10772 bytes

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