Malicious PDF — malware analysis report

Static analysis result for SHA-256 4027773378c493ef…

MALICIOUS

PDF

48.0 KB Created: 2020-08-08 18:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0de3306754f9b621156844e3951dbda SHA-1: 7bc5cbac72fa556597fa272a5b6818f134cd6aa9 SHA-256: 4027773378c493ef61656a145924e8465fe50f3eac8b5a2438ce5ae993508ca9
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The primary malicious URL identified is ttraff.com, which is used to redirect users to other potentially malicious sites. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files, suggesting a SEO-based lure to drive traffic 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=how+to+solve+math+word+problems+pdf
    • http://files.therobertabadydogfoodcoltd.com/uploads/1/3/1/3/131380495/e2dadbe.pdf
    • http://files.stephanieseguino.com/uploads/1/3/0/9/130969656/faramadudomajo.pdf
    • http://files.paulklein.net/uploads/1/3/0/8/130814960/9763878.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/p99_warrior_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4715/6903/files/australia_tourist_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/zijimof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/pobifuxab.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/8844681109.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/71634871408.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/1749432591.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/alter_ego_a2_gratuit_avec_cd_audio_mp3_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/33150871032.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/rexewexudorevumoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/croft_syntactic_categories_and_grammatical_relations.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/3220483039.pdf
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/certyfikat_kompetencji_zawodowych_testy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/lezikarujapulikel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006773.bin
97621aa117d3d5d25b6836d706e6c02e70aa89ead5cd2ed48c66277dbcbe125c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 5536 bytes
font_01_sfnt_off00007a22.bin
29cacc442e1904988e2bb6a5899393efe9dc57fef689049f023a3dfeebbd5b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A22 10104 bytes
font_02_sfnt_off00009cf4.bin
f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 16144 bytes

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