Malicious PDF — malware analysis report

Static analysis result for SHA-256 3521ed38ba28b05e…

MALICIOUS

PDF

55.0 KB Created: 2020-08-22 09:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a1d7f15d29d0ba7a5ad98d850a11bf SHA-1: f1ae6f84ac588418f306e2844cea35e624635198 SHA-256: 3521ed38ba28b05e0f895787553b306682a8548395645899c0a159b9a66e406e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=10th+class+science+ncert', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the document's purpose is to redirect users to malicious infrastructure. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.cc/pify?keyword=10th+class+science+ncert
    • http://files.xr103.com/uploads/1/3/1/8/131871698/3356286.pdf
    • http://xeleke.sailabilitybatemansbay.com/uploads/1/3/2/6/132696067/e3894.pdf
    • http://dalita.pawsadventurewalkingservice.co.uk/uploads/1/3/2/6/132695384/jebowupevisi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/introduction_to_mathematical_statistics_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/50269740909.pdf
    • https://cdn.shopify.com/s/files/1/0431/5614/4282/files/impuesto_alcabala_peru.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/capitalismo_socialismo_y_democracia_libro.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/221b_baker_street_game_clue_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5353/files/98114938076.pdf
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/orbit_easy_dial_4_station_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/internet_speed_meter_lite_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/foradixotobemux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/agreement_and_disagreement_expressions.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_off00009cf8.bin
713619110a56514a99486829918920a75ad1e2e521b2dcc842eda39d8481fcaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF8 4984 bytes
font_01_sfnt_off0000add4.bin
50d0f9b614f3ef3cc1f188bc0c204c49a073043deef0d226167267251de3d261
pdf-font-stream PDF embedded font (sfnt) at offset 0xADD4 9916 bytes